I would just for that certain time, so he can claim his winning amount. After that, there’s no more reason to let him allow doing the same thing, that’s already a big toleration if ever and it’s like you yourself as a parent is the one taking your kid into gambling addiction in the future.

Minors are strictly not allowed to gamble, and that’s very clear. So as much as possible, parents should monitor the online activities of their kids, or set limits for them, and never introduce gambling if they hardly understand it, just for their own sake.