There are specific websites for TOR gambling as well that you can play that are not really "legally binding" places but that makes it quite illegal and quite dangerous to play on those places too. They do not care about your IP, they do not care about your KYC, they do not care about basically any law at all because they are deep web and they think they are above the law or at least outside of law on what they do, we are talking about a system where people sell drugs and there are actually killer for hire in those places so gambling becomes like a very mild thing for that place, yet if they just take your money and leave, there is nothing you can do about it neither since nobody even knows who they are in the end. Which is why I still think that with all the advantages of them, the disadvantages are higher.
My opinion really is that if you're gambling with a crypto-only casino, then you're basically taking the same amount of risk at a clearweb-only site, as with any of those TOR specific sites (I don't know any actually though). I don't think we can also say "legally binding" -- ANY legitimate terms of service is legally binding. You can't just say stuff and not mean it, this goes for the customer as well.
Just because they're "deep web" (you mean dark of course) doesn't mean they think they're above the law. Just because an entity believes in privacy doesn't mean what you think it means.
You have the same risk at a clearweb crypto casino as you do at a darkweb one, if both don't operate with a known and legitimate business entity.