Could be in any context. I do it a little on UFC fights but that’s a relatively low amount and I can afford I to lose any time I do. It seems like it’s becoming a really wide spread problem though, at least in the US. At the same time I don’t see why it should be illegal. Granted I also don’t think any drug should be illegal.
Now that I’m thinking about it, I mainly have a gripe with people getting addicted to gambling. Can be in many different forms IMO; can be spending too much money at the Blackjack table (which is somewhat skill-dependent), whaling on lootboxes/gachas (where you’d literally never “win” money back), or even day trading (which is technically positive-sum)
In theory everything is fine in moderation, but then most gambling systems reward people to whale whether they intend it or not, so…