> Most jurisdictions regulate gambling to reduce societal harm.
The UK tried to ban gambling advertising during football matches but... "There were over 5,000 visible gambling advertisements during a recent Premier League match despite a ban that was expected to result in a reduction, researchers found."[0] That's one (1) televised match (you'd expect 3-4 at least per weekend to be televised.)
Not to mention that the Sky Sports coverage is sponsored by Bet365 (a gambling company, obvs.)
I expect any regulation of social media dark patterns to be equally successful...
[0] https://www.bbc.co.uk/sport/football/articles/ce9ree15yd0o
The "whistle-to-whistle ban" was always poor legislation. By its own terms it only suppresses TV betting adverts in a defined window and lapses at 9pm, and it never touched the categories that actually make up most of the advertising we see; shirts, hoardings, and structural branding, etc. It was an utterly pointless measure that serves to achieve not a single one of it's initial goals.