What happens is that some people use bots to farm the faucet all day long. If they purchase the 100 RPs boost per claim (acquired in rewards tab), it's possible to profit extra 1100 RPs daily, plus the normal RPs users already receive by just claiming the faucet.
It should be pointless for cheaters. I guess freebitcoin can easily detect such bots on their website because claiming a faucet every hour is unreal for usual users. I mean that it should be suspicious activity even if a couple of dozen accounts claim 100 RP every hour throughout the day.
Well, I don't know if more than one person is allowed to operate a same account. If so, the excuse of having a brother or relative sharing accounts and consequently farming the faucet all day long because they can't create one for themselves due to the IP restriction could be used. But as many users were alredy blocked there must be another security measures to prevent such abuses from happening.
Glad that freebitco.in manages the situation very well. However, I feel sorry for another faucets which have been constantly drained and ended abruptly because of cheaters.