No premium, it's just a question of whether people can and are willing to build enough in those other places. Space is a bet that they can't. Also, I don't think bitflips are a huge deal in space for neural nets, we already build in randomness via temperature. A little more shouldn't make things noticeably worse. Higher energy particles could be a problem over time, but when I looked into it, it looked like the incidence of very damaging particles for a given area was surprisingly low.