Advertising is speech and it used to be that if a magazine/newspaper printed a scam ad, it was horribly damaging to their business, both legally and morally.
I think YouTube has no idea that when I see 70% ads for things that are transparently scams, the other 30% of advertisers are being scammed too because I'm going to assume that they are all scams. Meta has been busted for putting it in writing that they could do something about scam ads but won't because it would cost them revenue in the short term.
They need to be made to care, somehow.
why, though?