They're not just betting on the current tech, they're building out infra like this because probably any future tech currently being researched will also require massive data centers.

Like how the gpt llms were kind of a side project at openai until someone showed how powerful they could be if you threw a lot more parameters at it.

There could be some other architecture in the works that makes gpts look old - first to build and train that new ai will be the winner.