The fact that its %4 in bitcoin alone is already big enough. I still fear that they may not end up doing this forever, I mean they may find the money now but it may not be possible forever. This is a huge thing. Think about it, what other place offers this much and has offered it for this long? There are of course some very obvious scam places that does like %10+ returns, and that's true they do exist, but they are all scams, never seen one last more than a year before. This place is doing something amazing as it is, I would suggest putting all that fun token money into bitcoin and %4 here as well, as an option of course, you could also keep them at fun token as well if you want.
Well, Freebitco.in is a bitcoin casino and their profits are generated in Bitcoins, right? So, why should it be a problem for them to collect more than 4% profit from deposited fund and give you 4% back? These deposits give them possibility to grow their bankroll and offer higher winnings and many games, I can't see 4% bitcoin APY being a problem and hard to give for a bitcoin-based business. And someone pointed out that they have been doing this for years, since 2017.