That's always an interesting thing. Where does autonomy end and the right of the government to intrude into your private life begin. The bottom line, that something is bad for you seems to be so logical. But when you think about it a bit longer you see that there are so many things that are bad for you that it would be next to impossible to regulate all of them. Ok, so you only do it for the things that are
really harmful. But then you're still left with smoking, alcohol, obesity, the state's lottery and casinos (always legal, for some weird reason, but just as bad as other forms of gambling), parachute jumping, social media, free climbing and a whole raft of other items that have the potential to massively ruin your (or even someone else's) life. And then there are the things you could do but that are illegal, such as speeding and drinking and then getting into the driver's seat of a vehicle.
I find this one of the most difficult to answer questions about how you should run a society. In practice, we aim to curb the excesses and treat them as if they are illnesses but even that does not stop the damage. In the end it is an education problem. People are not taught to deal with a massive menu of options for addiction and oblivion, while at the same time their lives are structurally manipulated to select them for that addiction.
In the UK for instance, where sports betting is legal (and in some other EU countries as well) it is a real problem. But the parties that make money of it (and who prey mostly on the poor) are so wealthy and politically connected that even if the bulk of the people would be against it I doubt something could be done about it. If it were made illegal it would still continue, but underground. It's really just another tax on the poor.
Sports betting is problematic for the sports too. It causes people to throw matches for money and it exposes athletes to danger and claims of purposefully throwing matches when that might not be the case. This isn't a new thing ( https://apnews.com/article/sports-betting-scandals-1a59b8bee... ), it is essentially as old as the sports themselves.