Everyone Says AI Data Centers Are a Bubble. Spending Says Otherwise

AI data center spending by the biggest technology companies is accelerating faster than ever in 2026. Even as a growing chorus of investors. Bankers and at least one major tech executive warns that the industry is building capacity faster than it can justify financially.

Commercial real estate and finance outlets tracking the sector describe capital expenditure from the largest cloud and AI companies climbing well beyond what analysts projected a year ago. Driven by competition to secure the compute capacity needed to train and run increasingly large AI models.

How big AI data center spending has actually gotten

Despite repeated warnings about a bubble, spending has not slowed. Reporting on the sector describes big technology companies accelerating data centre buildouts rather than pausing. New facilities announced on a near-monthly basis through 2026. The scale of commitment has made data centre construction one of the largest single drivers of capital spending across the entire technology sector this year.

Much of this expansion is now being financed through complex debt arrangements rather than straightforward corporate cash. Analysts say raises the financial stakes if AI revenue growth fails to keep pace with the infrastructure bill.

Who is sounding the alarm

The chairman of Alibaba has publicly warned about a “swelling bubble” in AI data centres. A notable caution from an executive whose own company is a major cloud infrastructure player. Separate analysis has flagged potential air pockets in data centre debt markets heading into 2027 if financing costs rise or AI revenue disappoints.

The warnings echo a broader pattern already visible elsewhere in the AI sector this year. Including delayed plans for AI data centre IPOs amid valuation concerns. Investors are growing more selective even as headline spending keeps climbing.

Why spending keeps rising despite the warnings

Technology companies argue that falling behind on compute capacity now risks permanent competitive disadvantage later. Making continued investment a rational bet even amid uncertainty. That logic has so far outweighed caution at the corporate level. Even as individual executives and outside analysts raise concerns about whether current spending levels can be justified by realistic revenue projections.

The test still to come

The real test for AI data centre spending will arrive when the current wave of facilities comes fully online and companies must show that AI-driven revenue justifies the capital already committed. Until then, expect continued announcements of new projects alongside continued warnings from skeptics. Little sign either side is backing down.

Watch debt markets tied to data centre financing closely. A noticeable repricing there would be the clearest early signal that the bubble warnings are starting to bite rather than just circulating as commentary.

Further coverage

Our earlier report on AI data centre IPOs being delayed over valuation concernscovers the investor side of this story in more depth, and our piece on theFinland government halting a Google data centre projectshows how local pushback is becoming part of the picture too.

What a slowdown would actually look like

Analysts say the clearest early warning would not be a dramatic single event but a quieter shift. Fewer new project announcements, longer gaps between funding rounds. Lenders demanding tighter terms on data centre debt. None of those signals has shown up broadly yet. Is part of why the spending-versus-bubble debate remains unresolved.

The comparison investors keep reaching for

Some analysts have compared the current AI infrastructure build-out to earlier technology investment cycles. Including the fibre-optic buildout of the late 1990s, where genuine long-term demand eventually justified the infrastructure. Not before a painful shakeout among companies that overbuilt or overpaid for capacity in the meantime.

Whether AI follows that same arc, useful infrastructure surviving a financial reckoning. Something closer to a sustained boom without a correction. Remains the central unresolved question hanging over every new data centre announcement this year.

What smaller players are doing differently

While the largest cloud providers keep expanding. Some smaller or mid-sized technology firms have begun renting capacity rather than building their own facilities. A hedge against committing capital to infrastructure that could lose value quickly if the bubble warnings prove correct. That split between owners and renters of AI compute is becoming one of the clearer dividing lines in the industry this year.

That rent-versus-own divide is likely to sharpen further as financing conditions shift. Giving a clearer read on who within the industry genuinely believes the current spending pace is justified by future demand.

Frequently Asked Questions

Is AI data center spending actually a bubble?

That’s disputed. Spending is accelerating rather than slowing. Prominent voices including Alibaba’s chairman have warned publicly about a swelling bubble in the sector.

Why are tech companies still building so many data centers?

Companies argue that falling behind on AI compute capacity now risks permanent competitive disadvantage. Making continued investment worthwhile even amid bubble warnings.

How is this spending being financed?

A growing share is financed through complex debt arrangements rather than direct corporate cash. Analysts say increases financial risk if AI revenue underwhelms.

Has this affected AI-related IPOs?

Yes. Several planned AI data center IPOs have been delayed amid broader valuation concerns tied to the same spending debate.

What would show the bubble warnings are correct?

A visible repricing in data center debt markets. A slowdown in new project announcements. Would be early signs that financing concerns are starting to bite.

Sources

• Bisnow — Despite bubble fears, big tech data center spending is accelerating faster than everhttps://www.bisnow.com/news/national/data-center-development/despite-bubble-fears-big-tech-data-center-spending-is-accelerating-faster-than-ever-131674
• Yahoo Finance — Beware a swelling bubble in AI data centers, Alibaba chairman sayshttps://finance.yahoo.com/news/beware-swelling-bubble-ai-data-144942151.html