Google and Microsoft already tried underwater data centers to better handle heat dissipation. It wasn't worth it. Hardware can fail and you need somebody to go in and swap boards and faulty cables. Every complex system has multiple points of failure. The wrong board and the whole container stops working. It was so much pain trying to maintain it under water they all gave up after the Proof of Concept stage.
How are they going to deal with it cost effectively up in orbit? Little nanosat modules? Humanoid robots that barely work today?
Be a lot cheaper (and faster) sending a tech in a little cargo van and a toolbox out to the suburbs of Memphis, Phoenix, or Bakersfield.