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This is faucet site, right? Then what kind of abusers we are talking about?
I guess faucet abusers.
I've seen this behavior in the past, abusers drained faucets within an hour using all kind of bots and bypassing captchas.
What I know is they already give one claim per one IP address so if you have many accounts also you can claim once every one hour.
No. Whoever is abusing system won't do it from one IP address(obviously).