While I agree with you that loot machines are worse because they're always available and hyper-immediate, we know that gambling addiction is a thing, and CCG cards fit the pattern. I mean to play a slot machine, people used to have to travel all the way to casinos, convert their money to coins, and then play the slots. The addicts still did it.

The problem exists in all of them, we're just talking about the speed of delivery and how it makes somethings worse-bad instead of just bad.