I like to gamble in bitcoin online gambling site, because it is safe and anonymous. In casino's you will be ask for your ID and be in legal age. In online, you can bet whatever age you are, you will just register and you are good to go.
Not every online casino that you go to would be safe. There are a lot of reports in the scam portion of the forum and you could cross check it with your own findings if it is really safe. People who have bad ideas in mind would do anything it takes to get easy money. Its better to be safe than sorry.
I agree with you on the part where you could just register and you are good to go. Its just that easy but you should still be careful.