I'm skeptical that accounts with megaproviders can effectively be isolated. If one account gets banned, and Google determines that another account is owned by

I'm skeptical that accounts with megaproviders can effectively be isolated. If one account gets banned, and Google determines that another account is owned by the same person, they may well ban the other account too. The solution is to register your domain (at least) with a provider that doesn't have so much insight into their users. Again, this applies not only to Google, but also to Amazon and others. It's really a problem with centralized reputation.