There are lots of examples where banning stuff does work. For example, its very rare to see anyone smoking in a restaurant or cafe - because it is banned. Perhaps more on point: cigarette advertising in Australia doesn't happen. No logos, no sponsorships, no TV ads... because they are banned. So then, banning vape ads is obviously a similar thing to try. But apparently TikTok, Instagram, and youTube are not doing a good job of enforcing it.