I've used vanced for years and revanced for easily 6 months. I haven't heard of anyone getting banned since it uses MicroG for the login, but there could be a part of the TOS everyone signed that says you can't use your account to bypass their "rules", so it could be a technical violation 🤷♂️
I've been logged in on two different accounts for years and haven't noticed anything. It uses microg to handle the login stuff and I haven't heard of any issues like that happening with others either.