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I do, as well... and it typically just takes a 2-3% flag to make them disappear.

Right, 1% can make them disappear. But it does not stop them from their spamming unless one downvotes with enough voting power to affect their reputations and get their attention.

Yes, it is much like trying to kill mosquitoes in a hot Mediterranean night. You can get a couple but they will keep coming for more blood.