Gambling is inherently exploitative and no amount of regulation will align the incentives for commercial operators. You also don't want to ban it outright, as it may descend into the underground otherwise, so this looks like a reasonable area for the govt to take direct control.
> https://en.wikipedia.org/wiki/The_Tote
It operated alongside other private operators, but was entirely State owned and operated until it was privatized in 2011. I forget the specifics of it, but the Tote uses (or at least used to) some kind of "pool betting" model that meant it didn't profit directly from customers losing bets, being agnostic about the results was meant to reduce predatory pressures etc.
I think this likely helped a lot to give those who wanted to gamble somewhere they could always trust to honor the arrangement and avoid "underground" operators, I don't know that it helped all that much in reducing the social harms etc though.