Here's the thing, Google already does this (https://support.google.com/accounts/answer/32046?hl=en https://support.google.com/accounts/answer/32046?hl=en). Also

Here's the thing, Google already does this (https://support.google.com/accounts/answer/32046?hl=en https://support.google.com/accounts/answer/32046?hl=en). Also, I think it would be fair to say that the user shouldn't have accidentally deleted their account. Maybe the UI for multiple sign on isn't that great but account deletion is spot on. The page details exactly what account deletion will do and you even have to click a checkbox that says "Required: I understand that deleting this service can't be undone and the data I delete can't be restored." before continuing. It baffles me to think that there are people out there that manage to do this "by accident" and then manage to wait long enough to be unable to restore their account "by accident".