You likely come from a culture that lets pharmaceutical companies advertise on TV. You likely come from a culture that doesn't restrict fast food companies from advertising during children's programming. You likely come from a culture that doesn't force all product placement to be clearly marked with an icon on the programme.
Advertising in the UK is much more heavily regulated than in other countries. We don't believe in the right for companies to advertise whenever or wherever they like.
Gambling is fully legalised, in part so that it is easier to regulate, including regulating when and where it is advertised. There is talk from banning gambling companies from being shirt sponsors.
This is, I think, a more mature approach than banning or heavily restricting online gambling and pretending it isn't a problem.