Alongside a password manager and keeping things up to date, using an ad blocker is truly a foundational security practice these days. The big advertising players simply have all of the wrong incentives to control this problem. They could massively reduce the volume of scams advertised on their networks, but it’d be worse for them on two fronts: they’d have to pay for more moderation, and they’d lose billions in reven…
The only reason to fight against the scams is because one cares a little about ones viewers (well, and I guess maybe a bit of brand safety). Which seems to not be the case for the vast majority.