I think the realistic expectation is small modular reactor dunk into the bottom of the ocean with server containers, then attached to the rest of the internet through either fiber or starlinks.Yea sure. And in the 50's the automakers said everybody in the 70's will be driving flying cars. How well did that work out? Or back in the 90's when hydrogen was the latest fad. I'm still waiting to buy my nuclear powered ride. Refuel every 100,000 miles.
Free cooling, close enough distance to the customer nearby, no need for large infrastructure, or if you want to you can dunk a mini nuke in the ocean and run a desalination plant with it, then pump the fresh water back to shore.