Unfortunately, not all players are doing their job before playing on a site.
Usually, they will skip such process and once they are about to withdraw, that's when they will find out such requirement.
Well, for me, it is the fault of the player himself. The ToS is there for a reason, a reference for both players and the owner of the site.
If you fail to check it out, then, it is your fault. So yes, as a responsible gambler, one should always at least browse the terms and conditions.
If he is not ready to comply with their requirements, then, move on to the next. Remember, we have our own will when it comes to selecting casinos.
I agree,as user, it is your responsibility to check the ToS before making a deposit.
It is understandable from the casino side too, bonus abusers keep taking advantage of free promotions and don't contribute anything on the website.
Wagering requirements are there for a reason and as gamblers, we have to understand how industry works. Even if you are a new gambler, better make small deposits in case something goes wrong after the withdrawal request.