Space-grade photovoltaics are >10x more expensive than ground based panels. Add some (Tesla) utility scale batteries and it can run 24/7. No need for expensive radiators or rocket launches. And personnel can upgrade the hardware every time there's a new generation of GPU's.

Putting datacenters in deserts around the equator is a much better idea than in Space. If you're really optimizing for cost that is. If you're optimizing for SpaceX meme-stock valuation the former wins