If they are acting maliciously, they will take the choice that most hurts you and/or benefits them.
If the key is useless to them and revoking it hurts you, then they would do that.
If the key wasn’t useless to them, then… they would just use it and not revoke it?
Unilaterally decide they should be revoked, without contacting the owner?
And that’s not malicious?