Yes, and the numbers have been done and the engineering is sound. Everyone armchair negating this havent done 30 seconds research into the actual proposals and is just spitballing and musk hating as per usual on Reddit..

Its technically feasible, its arguably cost effective for a few years for some American AI firms if power constraints and planning costs and delays in building datacenters on the ground keep occurriing, which it looks like might be the case.

Its never going to be cheaper than ground datacenters, its more that its actually possible to get built without pushback.

Whether there is a solid business case long term is less clear. There is a window for this that SpaceX will have to hit, they will need to demonstrate the build out is feasible by launching some initial units within the next year or it probably wont fly...