"An account which can survive the disappearance of the server, or service, that it originated from"
Great idea. I have just one question : who is paying for the maintenance of the account ?
Whether you signed up for free or have a paid hosting account, this new idea supposes that BluSky is going to be dealing with the survivability of said account.
With what money ?
Because that's what it always boils down to.
How is BluSky going to fund maintaining all those free logins ? They are free, nobody is going to pay to maintain them.
I think BluSky is going into PieSky territory.