Thrill rides? Probably not, I don't think there are many people having their life ruined by their addiction to amusement parks.

Alcoholic drinks? History of bans like that suggests that it's not a good idea. However that doesn't mean that nothing can be done. Addictions to alcohol, drugs, smoking, gambling damage both the person suffering from them and the friends/loved ones around that person. It is most likely impossible to drive the harm down to 0, but it can be reduced by denormalizing casual alcohol intake and sitations where people are peer pressured into consuming alcohol to fit in (especially in young adults), etc. People addicted to those substances/behaviors need a safe environment, a society that won't prompt them to relapse over and over because everyone around them is a casual user. Those are my thoughts, but I'm no expert.

Hmm, so why do your perfectly reasonable thoughts on how to reduce alcohol abuse in light of not being able to simply ban it not apply to loot boxes as well? How is it different such that "completely banning", as you suggested, is a good idea there where it isn't for alcohol, drugs, smoking, and gambling (of which loot boxes are clearly a subcategory)?