Comment by DennisP
I think a prerequisite to doing any really big stuff in space would be fully and rapidly reusable launch rockets, which could get costs down by a couple orders of magnitude.
And geostationary isn't necessary for this. You could go a bit higher or lower and still have 24/7 sunlight. Relay your communications through Starlink or something and you have full connectivity.
That said, I think orbital data centers still don't make sense, for all the reasons described in the article.