Watch the Scott Manley video where he does a very deep dive on the physics of cooling a data centre in orbit. He takes into account reflected heat off the earth and a LOT more.

TLDW summary: it’s entirely doable. Anyone that says it isn't simply hasn’t looked at the physics and math.

Will it be financially beneficial is a totally different question. Of course there were endless experts saying reusable rockets and electric cars never would be.

> I've never heard someone explain what bottleneck exists on earth

1. Power.

2. Political will (current massive pushback over data centre builds).