For example, you can get married at 16 in the UK, but can't drive until 17 (it's not a priority as we didn't build so many car-dependent hellscapes), and you can buy alcohol at 18 or be given it with a meal by your parents at younger ages, because we didn't have puritans making motorway funding contingent on passing strict drinking laws like the USA did.
Anyway, what I remember from the UK's Gambling Commission giving committee evidence to MPs on this topic is to ask the question: what is gambling? What activities need strict regulation, audit trails, compliance inspectors, etc? Village fête tombolas? Fundraising prize draws? Radio station cash giveaways? Top trumps? Panini sticker albums?
Lootboxes are not slot machines or FOB terminals. If they can't be "cashed out", they are more like collectible card games... which are also IMHO a plague on humanity, but not the same level of destructive activity as gambling for cash. They do need regulation, given how prevalent they are in games popular with teenagers, but need different regulation from casinos.
Games like Fortnite deserve regulation too, weaponised FOMO to keep money rolling in is sketchy.