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.