Remember the dotcom bubble? Insane valuations, money-losing companies promising profits "just around the corner," and investors who convinced themselves this time was different. A detailed analysis making the rounds on Wall Street suggests we're watching that movie again—just with fancier graphics cards.

The math is brutal. OpenAI is projected to burn through $143 billion in negative cumulative free cash flow by 2029. They hit $20 billion in revenue last year, which sounds impressive until you realize they torched $17 billion in cash to get there. Best-case scenario, they're cash-flow positive by 2030. Not profitable—just done hemorrhaging money.

And OpenAI isn't alone. The four largest hyperscalers—Microsoft, Amazon, Google, and Meta—expect to collectively spend $700 billion on AI this year. That's trillion with a T when you zoom out a few years.

Here's the problem: none of them are breaking out exactly how much money AI is actually making them. Microsoft doesn't separately track AI revenue in its 10-K filing. Neither does Amazon. Google won't say how much revenue Gemini generates. Meta claims AI boosted ad revenue but won't quantify it.

If AI was printing money like Wall Street believes, these companies would be shouting those numbers from the rooftops. When a company buries the results, it's usually because they're not impressive. The fact that AI revenue gets bundled with existing products should make investors nervous.

Then there's the infrastructure nightmare. The Vogtle Electric Generating Plant—America's most recent nuclear project—took 11 years to build, cost $24 billion, and generates 3.4 gigawatts. Project Stargate, the massive AI data center initiative, needs roughly 7 gigawatts across five locations. Best case, you're looking at a decade before the power infrastructure exists to run these systems at scale.

Investors aren't going to wait a decade for returns. They never do. When the first big AI company misses earnings or admits the path to profitability is longer than expected, the selloff will be swift.