Many places won’t sell M rated games to minors without a guardian present. It also allows guardians to make better informed decisions about what they’re about to buy for their children. It may not be a silver bullet, but it might start to put some pressure on studios to think twice about putting gambling in games targeted towards children.
I can’t think of many minors who would be able to afford a game, so it’ll be the parents buying it anyway.
I could see it helping.
“I have to inform you that this game is rated M for Mature, and isn’t suitable for minors.”
“What? It’s just football, isn’t it?”
“It says this game has gambling that uses real world money.”
I don’t know how many sales it’d stop, but at least parents would know.