Hardware

It's slightly less stupid than data centers in space I suppose. But I still find it pretty weird.

You will have to be tethered to land anyway. Properly high bandwidth networking as you would usually see to connect a data center (on the order of a dozen terabits per second) only exists through fiber optic cables. I'm sure of this point, because optical networking is my day-job, though we only run 400 Gbit/s links on the fastest edges since we're a small national network.

As for power, well there are 80 MW ship engines (e.g. Wärtsilä-Sulzer RT-flex96C, which has even been built in Korea under license before), so it's not impossible I suppose. But if you are tethered, then the country you're tethered to will probably forbid you from burning bunker fuel for 80 MW on its coast. At which point you'd be reduced to running clean diesel or something. That I expect would make the power more costly than just tethering to an electric grid

So now we have a big barge rather than a ship. What do you really save then? I guess the price of the land? And you gain access to copious amounts of saltwater, so you can do closed loop cooling with freshwater, and do the secondary heat exchange to the ocean. But you could do that by building on the coast too. Okay I guess you might gain tsunami security over a coastal building.

If this is a real proposal why don't they tell us the material advantages they expect, rather than making us guess?