It seems you understand the addiction well. What about stop smoking 
I agree the Uk market can be milked sadly much more. But along with AML/KYC annoyance the opportunity will loom for black market.
Problem is that UK is sofisticated developed soft authoritarian state. They control both internet and money flows. So the money used has to be crypto and the sportsbooks must be probably on decentralized infrastructure. SOmething better than tor must appear, it is too slow.
On the top now we live in era of credit and not savings, so it is much easier to max the credit card directly. Get the borrowed money to crypto is costly and takes time. Nothing for impulsive gamblers full of hopium.
Gambling in developed world is becoming a tax itself. They want all become gamblers, but just at slow bleeding level, not too destructive, just a little bit. If you do not gamble, you pay less taxes; if you gamble too much, you are a net cost for social security system. You have to be in the middle(class). Same with other taxes: state want you to earn well, to pay big taxes, but not that much so you can afford to be out of the system.
It is perfect. Like robots.
We are all bloodsucking ticks, hungry, devious
each one latched on to the ass of the previous
when the last and the first latch on it can be shown
ass-blood sucked by the first from the last is his own