There's already several companies doing that kinda thing for telescopes that point back down at earth. For telescopes that point away from earth I don't think anyone wants to do it because there's not much $$ in it.

I've seen at least a few startups try similar kinda things ("let's launch a constellation of cheap satellites and rent time on them out!") and they flopped hard. My favorite tried marketing as a "cryptocurrency in space" thing (LMFAO)