I had someone invade the League of Legends account I used for almost a decade after me not using it for a year or so and cheat to their hearts content. That caused the account to get permanently banned with absolutely zero help from Riot Games' support on how to get it revised.
In your system I'd never be able to play an online game again, only because a single account of mine used an email / password combination that leaked god knows where. Needless to say I'm not a fan.
Yes this is a very real issue that would need to be solved by the service I proposed, I specifically called out the appeals process and account hijacking resolution in my original comment due to their importance. It needs to be centralized because it's an impossible task to ask every game studio to get all these things right.
In your system I'd never be able to play an online game again, only because a single account of mine used an email / password combination that leaked god knows where. Needless to say I'm not a fan.