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.
I think privatisation happened quite a while ago (mid to late 1990s) but my vague memory is that there was some sort of deregulation in the mid 2000s (or at least that's when I remember the ads becoming incessant) and that seems to have coincided with the endless offers of bonus bets, deposit matches, bet returns etc.
Casinos exist, but are basically a regulated service (possibly private, but as far as I know there's only a single operator).
> 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.