And also they don't need some registrations, the gamblers can gamble anytime they want and there is no restriction for it. Unlike the usual online gambling site, it requires identification cards that must be provided immediately so that the site will approved you to be a legit player. But with bitcoin gambling, it doesn't require at all.
I really don't think so because as my self in our country online gambling is not illegal but it can attract us to play it using our bitcoins because first using bitcoin than other fiat that is in online wallet is very slow in processing unlike bitcoin it is easy and fast transaction if you send money through gambling site then it is just in seconds or minute. The thing is it is all about fast and not in slow way
We are just doing it for the trust because if these sites will not pay us we cannot do anything to collect it. I am not really a big fun of online gambling before due to the fact that popular online gambling sites requires big deposits to start but with bitcoin even less than $1 is enough to have fun.