A significant difference with gatcha games compared to traditional cash gambling is that you cannot chase your losses. You either get the skin/item or you don't, but there is no false hope that you could recover the money you gambled with if you spend even more. Obviously, that's not true when the game allows you resell the skins individually for real cash (eg. CS skins). Chasing losses and borrowing money to earn back the money you lost and getting even more in debt is what makes people kill themselves in casino parking lots.

Yes the best examples of chasing is probably TCG, followed by Valve.

With young people, not sure that it matters. They will become gambling age eventually. The psychological affects are there. See Genshin and Monopoly Go.