The payout is very little, and it is decreasing, where will it arrive? 1 satoshi 
What do you expect,when the price of bitcoin raises the faucet will keep on decreasing and if everything sails smoothly it might arrive to one satoshi 
The 4% interest isn't worth it, even Bitfinex lending provide more than this and I trust bitfinex more than freebitco.in.
People seem to have forgotten about the 30% haircut they had to take when Bitfinex got hacked for like 130 million.
There are risk involved if you are trading in an unregulated market.