Genies are tricky to get back in the bottle - especially when you can just as easily go to a company based in the Caymen Islands or wherever and spend that way.
Phones allow you to gamble from anywhere on anything. You could ban advertising it during sports broadcasts, which would probably reduce things a fair bit, but that's likely to impact the "casual" gambler who
I don't do sports, but occasionally I'm in a pub and they are on. I've seen in the UK over the years how pervasive it is now compared to a generation ago. The advertising companies paint this picture of it not only being normal, but also being the only way to enjoy a game. I'm fairly sure that my parents and grandparents who were big into football enjoyed games quite happily in the past.
In the 90s the typical sports gambling in the UK was old men putting the price of a pint on the pools or in a fruit machine, where you guessed which team would win. The winning limit on the fruit machines was about 5 pints worth, and the pools was a confusing weekly maths challenge while listening to results such as "Forfar Four, East Fife Five"
The explosion of "fixed odds betting" machines which dispensed with the social aspect of going to a pub and spending £5 over lunch in favour of extracting £50 in 5 minutes and moving on, combined with general high street abandonment led to a terrible blight on uk town centres. Online gambling meant you no longer had to go into a seedy shop to hand in a betting slip for the 3:40 at doncaster, then wait for an hour or so in the pub next door to watch it with acquaintances, but instead you could do it all from your own home.
Gambling has become industrialised in the last generation, emphasising the cash extraction and reducing the pleasure it brought. It's no longer £3 for an hour of interest, it's become about extracting as much money as possible (and thus the adverts are all about winning big bucks because you as a sports nerd know far more about which player will score first than the betting companies do)