I was having this discussion the other day with a friend, I do believe as an adult you should be allowed to do anything you want providing you're not harming others.
That said, there is a HUGE need for more regulation around advertising, cut off limits and companies recognising users with a problem.
If you take a Bar for example, most barmen will notice you're already drunk as hell and cut you off, probably kick you out if not get you some water etc. It's actually a legal requirement to stop at some point in countries.
Casinos on the other hand, if you are down 99,000 out of your 100,000 with zero hands of games won, that casino is going to plow you with a good time until it has that last 1,000. It's disgusting.
I hate gambling , I've seen its effect on friends of mine and their families. But I would never stop an adult doing what they want, while knowing the risks.
Always keep 900 for emergencies.
Unlicensed casinos and betting apps harm others.