There is a compute shortage.
In fact, for all these companies to do what they're going to do, they need a massive, massive massive amount of data centers, a highly improbable number of data centers that need to be built in an highly improbably short amount of time.
And the capitals about to dry off in about a year. So it's a race between these improbable timelines on data center construction, with capital evaporating.
Source for capital drying up in one year? Not trying to be snarky but that's super big if true.