User support, or rather the lack of it, is probably one of the main drawbacks of freebitcoin.
I have a small amount in there, because of the daily interest they give and because I still play the free game from time to time. When I see these things I think about withdrawing it but for the moment I hold on because it's not a big amount.
However, I highly doubt that freebitcoin will end in the foreseeable future. At least because there is still a huge active audience, including whales, who are willing to wager huge amounts of BTC. A good example is a user who won the Lambo lottery and then wagered several hundreds of BTC on the freebitcoin site.
It is a money making machine. I too doubt that anything bad will happen soon but the higher they are the harder they fall, you know?