Yeah it's very normal.
No site is going to release really money to kids potentially without some sort of ID, that would be daft. It's like when you deposit, you have to use your debit/credit card etc which automatically verifies you're of age to play but with these free no deposit bonuses they have to be able to prove you are of age.
The site itself is legit yes, I have used it. However, I wouldn't bother, it's actually quite difficult to clear that bonus purely because they will only release $15.00 to start with which isn't much of a BR to pay rake and build a roll of. I think you will find you will have to deposit in order to keep playing. You will get payments in segments of $5.00 after x amount of fpp's and you won't get 50% of the bonus until you have earned 10,000 points which is a lot of rake. So, to clarify, they do offer $150.00 BUT you will only get a $15.00 to start with and have to earn points to release to bonus, very slowly and gradually and most likely will have to deposit purely based on variance..They obviously don't say this to you and just make out like you get $150.00 straight of.
The best site to go for if you want free money and get a decent amount to actually play with is pokerstratergy and sign up there. You get $50.00 with a realistic chance of clearing it quite easy + you get rakeback and so on.