This reminds me of the Pangeos megayacht from a few years back.

https://www.cnn.com/travel/article/pangeos-terayacht-turtle/

TL;DR: Pangeos was a concept for a floating free city that trended a few years back, but was never built for obvious reasons, just like how these floating data centres will never be built. Presumably some people were bilked into paying money to the Pangeos scammers, just like there will be those who "invest" in this.

The problem is that it costs a lot more to put a nuclear reactor into a permanently sea-worthy form-factor than it does to build on land and put up with some pesky taxes. There are plenty of places with lax regulations (environmental and otherwise) that will be happy to let you build whatever size data centre you want if you're willing to build the power generation too.