The problem with casinos is that it's easy to make one that is not fair (fraudulent odds). To prevent that, you need some sort of auditing system. And to do that you need to issue limited licenses. What this causes is that in most of the world, those licenses end up in the hands of really trustworthy characters that would never hurt a fly.

If it wasn't for that problem, I'd just be pro making casinos as straightforward to operate as opening an e-commerce shop. I have no qualms with adults gambling their money away, my problem is with mafiosos getting it all.