50 000 satoshi are not so much!
How much you expected for something that is free, only register is required then 50k satoshi is worth enough to try especially of this site offers a good/unique way to earn something.
Well, statistically, no gambling site will give you chance to earn something, instead it will give you chance to lose your money in more unique way.
Some people here don't realize that standard bitcoin fee for the median transaction is currently 13,560 satoshis - so op offers ~25 cents for registration - just a reminder.
non deposit bonus only made to attract people testing particular sites and because of that most likely non deposit bonus always have high wagering requirements before can be withdraw and i think OP means at here only want to see how interested people will trying his site and i'm pretty sure 50000 satoshi as the welcome bonus will have wagering requirements before can be withdrawn too but from those amount if you were lucky there is possible to double the bonus or even you could have got more