I think every business that is destined to make people's lives worse should be taxed very very heavily. However at what point are you doing something that is against freedom? For example beer is bad for you, it is not healthy and if you drink too much beer for too long you will die, that is a known fact but its legal and you can buy it and drink it if you want, for a world where many drugs are bad for you and illegal, for some reason things like beer and cigarettes are allowed.
So if you say 500%+ tax on the price and 50% tax on the income for something like beer, so instead of 3 bucks its 15 bucks per beer, would that be against freedom? I think many people will say so, but then how can you allow weed to be illegal in many nations? Long story short there is a line there but it is a blury line and nobody really knows what to do about these things.
I'd argue here that casinos aren't businesses designed to make your life worse. It's just there as an establishment, business, as a casino. It in no way forces anyone to actually partake in their business and the person themselves is solely at fault if their lives were ruined due to addiction. Same idea with beers, tobacco, etc. Sides, price increase only pushes people to spend more on it since if they really want to buy it, they'd still do it. Most people have already experienced it anyway, prices increasing gradually throughout time, it didn't really stop them.