Gambling Bitcoin and ordinary gambling are just the same things I think. It's just that if ordinary gambling uses ordinary currency, then Bitcoin gambling will use cryptocurrency as a tool for transactions. With cryptocurrency, I think people would prefer Bitcoin gambling instead of ordinary gambling. People will be easier to play gambling online and in secret without known to many people, there are some people who like that. With cryptocurrency, transactions and money transfers become encrypted and confidential. It is difficult for people to track and know gambling players or gambling service providers.
And it is exactly your last statement that totally makes it different. It is easy for government to impose a law and it would be very hard for anyone to go against it since you can easily get nabbed. Even if you want to go underground, one way or the other, you will still get leaked out.
After all, with cryptocurrency and online casinos, you can stay anonymous as long as you want and not a single government will ever know if you are gambling or not unless you want to go surrender yourself to the cops.