So much that could be done with those. Mandating age checks. Covering at least 80% of them with warnings about gambling. Maybe plain packaging and only allowing them from behind counter or unmarked automated systems. Treat them as tobacco products.

OK, we mandate age checks. But what is the minimum age? Am I in trouble if I make a straw purchase of that product for someone else?

You can just ban them. Pass a law that says if someone buys an item the identity of which is undisclosed, and they're not happy with it, they're entitled to a full refund.