This is a difficult topic and it would be hard to find a good solution. e.g., when is one active/passive? how would this be done from a technical viewpoint: wouldn't the user's keys be necessary and if not, this could/will be used for exploitation etc.
If we don't know now if Hive can scale or adopt so many new users then we are probably going to fail when the time comes. I hope somebody is thinking about this problem
Delegation do not require the users keys.
It is up to the one delegating to make the decision to pull it back or not; not the user.
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