This is more common than it should be for accounts. So best to assume the least charitable and plan accordingly.

You lose access to your consumer Gmail, Drive, etc if your YouTube account gets banned for comments.

You lose access to your Epic Games dev account if you get banned from Fortnite (unless they decoupled this in last few years).

AWS used to be hard-linked to your Amazon shopping account back in the day (they can't separate them for you if you ask).