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“Cloud Market Goes ‘Pyrocumulus’” describes the cloud industry’s explosive 2021 expansion. George Leopold used the image of pyrocumulus clouds—towering clouds formed by intense fires or volcanic eruptions—to convey a market growing with unusual speed and energy. The article’s figures are a historical Q2 2021 snapshot, not measurements of the cloud market in 2026.
What the “pyrocumulus” metaphor means
Pyrocumulus clouds rise from extreme heat. In Leopold’s August 3, 2021, EE Times article, the metaphor signals a cloud-computing market expanding so rapidly that its growth resembles a physical force: large, concentrated and difficult to contain.
The comparison also reflects the industry’s scale. Cloud demand was no longer a niche technology trend. Enterprises were moving substantial workloads to hosted infrastructure and platform services, while the largest providers were building data-center capacity fast enough to support that demand.
John Dinsdale, chief analyst at Synergy Research Group, called the market “a runaway success story for Amazon, Microsoft, Google and some other cloud providers.” He also noted that growth rates were increasing even in a market that was already “huge and rapidly developing.”
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How fast was the cloud market growing in Q2 2021?
Synergy Research Group estimated worldwide cloud-service revenue at $42 billion in Q2 2021. That represented a $2.7 billion sequential increase from the previous quarter and 39% year-over-year growth. These are Synergy’s 2021 estimates as reported by EE Times, not a current market total.
| Measure | Q2 2021 figure | Qualification |
|---|---|---|
| Global cloud-service market | $42 billion | Synergy Research Group estimate for Q2 2021 |
| Quarter-over-quarter increase | $2.7 billion | Sequential increase reported for Q2 2021 |
| Year-over-year growth | 39% | Q2 2021 compared with Q2 2020 |
| Infrastructure and platform services growth | 41% | Q2 2021 growth rate; these categories supplied most quarterly market growth |
Infrastructure services provide rented computing, storage and networking. Platform services add managed tools and environments for building and running applications. Their 41% growth rate explains why physical capacity and capital spending were central to the article’s argument.
Which companies dominated the market?
The market was highly concentrated. AWS held about one-third of global share. Microsoft Azure and Google Cloud together held roughly another third, while the next 20 providers collectively accounted for about 28%.
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| Provider group | Approximate global share in Q2 2021 | What the figure shows |
|---|---|---|
| Amazon Web Services (AWS) | About one-third | The single largest provider |
| Microsoft Azure and Google Cloud | Roughly one-third combined | The two major challengers together approached AWS’s scale |
| Next 20 providers | About 28% combined | A sizable but fragmented group behind the leading three |
The remaining share belonged to other providers and categories not itemized in the article’s summary. Because the percentages are rounded, they should be read as an indication of concentration rather than an exact accounting that must total 100%.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteWhy data-center investment was so large
Synergy Research Group commentary said Amazon, Microsoft and Google were typically investing more than $25 billion per quarter in 2021. Much of that spending supported more than 340 hyperscale data centers.
Hyperscale facilities let providers add computing, storage and networking capacity across regions. They also support the managed databases, analytics, artificial-intelligence tools and developer platforms that distinguish cloud services from simply renting a virtual machine. The investment therefore covered both the physical facilities and the expanding service portfolio running on them.
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High capital spending was also a competitive barrier. A provider with more regions, larger facilities and broader platform services could spread costs across more customers and offer capabilities that smaller competitors would struggle to reproduce.
Why enterprises were adopting multi-cloud
Multi-cloud means using services from more than one cloud provider rather than placing every workload with a single vendor. The article identifies vendor lock-in as a central reason enterprises were taking this approach.
Reducing dependence on one supplier
When one provider supplies infrastructure, databases and application tools, moving away can require rewriting software, changing operating procedures and transferring large data sets. Using more than one cloud can limit the business impact if pricing, service terms or strategic priorities change.
Matching workloads to provider strengths
Different providers may offer advantages in particular regions, services or compliance arrangements. A multi-cloud design lets an organization choose among those capabilities instead of treating the market leader as the only option.
Keeping negotiating leverage
Multi-cloud can give a large buyer alternatives during contract negotiations. It does not eliminate switching costs: operating across clouds usually adds tooling, security, networking and staff complexity. The trade-off is strategic flexibility in a market dominated by AWS and the other hyperscalers.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to compare the major cloud providers using this article’s evidence
The 2021 article supports five useful comparison axes:
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- Market share: AWS was the clear individual leader; Azure and Google Cloud were the principal large-scale challengers.
- Infrastructure and platform breadth: compare the range of hosted infrastructure and managed development services, not only raw compute.
- Geographic reach: examine where each provider operates regions and data centers relevant to the organization’s users and regulatory obligations.
- Capital investment: the reported spending above $25 billion per quarter illustrates the scale required to expand hyperscale capacity.
- Lock-in and portability: assess how easily applications, data and operational skills can move between providers or run across several of them.
These criteria are more informative than choosing a provider solely because it has the largest share. Scale can improve availability and service breadth, while portability can reduce strategic dependence.
What remains relevant—and what does not
The article remains useful for understanding how cloud economics looked in mid-2021: demand was accelerating, the market was concentrated, hyperscalers were spending at extraordinary levels, and enterprises were weighing that scale against lock-in risk.
Its numerical snapshot should not be presented as a 2026 market measurement. Current shares, revenue totals, forecasts, data-center counts and investment levels require newer, dedicated sources. The article is authored journalism reporting Synergy Research Group and Technavio estimates, rather than a primary market-data release.
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