From what I have heard in the first round of Strat the rules on logging in on other's cd-key's weren't all that clear, at least at first. I have been told that it was pretty commonly done by a lot of clans including the early Shogunate leadership. Sure the Greys carried it to an extreme level, but I don't think it was as black and white as nowadays whether it was considered cheating.
Doubt the entire early Coalition or Merc leadership has clean hands even in this very regard. Not too consider various other bug exploiting instances. There is no morally superior side in Strat, Strat brings out the worst in everyone.