If the key leaks the block has to be permanent. You can't distinguish attacker from rightful owner.

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True, but the idea was to warn those that follow the hacked account, before you unfollow them. So they have time to react and unfollow the spammer.

Why does it matter if someone I follow follows s spammer if the person is not reposting the spam messages?

Because the follower graph is used to identify spammers. If non spammers follow spammers, this gets harder to do, hence the penalty.

I see, that makes sense.