There's a bubble around data centers, mainly. That's fueled by projected demand of AI and assumptions companies make about how the pie for that revenue is going to be divided up.
What's very real is the rapidly growing amount of revenue for both OpenAI and Anthropic. That's already tens of billions per year and growing quite rapidly. Investments against that kind of revenue aren't completely horrible. To a point. But at the multi trillion dollar valuation level, of course there are going to be issues with living up to those expectations.
In my view some of the base assumptions are looking not so solid currently. It's not a given that OpenAI and Anthropic will end up with most of the revenue. The Chinese trust Silicon Valley just about as much as vice versa. Which is why they are doing their own models, chips, and data centers. This is driving a rapid commoditization for things like frontier models, open model weights, and chips. This in turn gives countries outside the US a lot of options to stay independent. Which burst the bubble that all that global revenue was going to flow towards Silicon Valley. Some of that still might. But that will have to happen based on cost and merit.
There are also geopolitical circumstances that cause most data center plans to be bottle necked on permitting, chip shortages, grid connectivity, availability of gas turbines, gas, solar panels, inverters, batteries, water, and other resources. As it turns out, you can't just willy nilly plan for hundreds of GW of data centers and expect those to pop into existence overnight along with all the needed infrastructure. Most of the announced/planned capacity for this will likely not be realized. Certainly not this decade. 5-10% by 2035 would be a lot given all the constraints and scarcity. No amount of reality distortion can change the physical constraints on this topic.
The good news is that most of the money needed for this hasn't been spent yet. And what has been spent won't be going to waste. Up and running data centers are a hot commodity right now. They won't be running idle if a bubble bursts. But probably investors dreaming of multi trillion dollar IPOs might be a bit more cautious now that SpaceX stock is trading well below its IPO value.