I will start with one to begin the discussion. If you are putting huge amounts at stake and want to keep identity private, online gamblign comes as a boon.
Online gambling allows you to gamble anywhere and anytime. We can say that in tradional gambling, we're very limited to the time and the place since we need to go to casino or somewhere and it more likely open only at night.
Online gambling has given us a lot of freedom which means that we can play gambling even in odd hours too and we do not need to go out of our place to enjoy the gambling.
Keeping your identity private is probably possible only with blockchain gambling. I doubt if centralized gambling have a way of preventing governments from attacking them in any way
Not only privacy is hidden through online gambling, but also it has given chance to underage kids to play gambling as there is no KYC in online gambling.