Given the hyper targeted efficiency of the modern ad networks, are you sure the fake crypto and tech support ads are going to everyone and not just to you?
My concern would be the opposite. What if scams are only targeted towards those that are likely to fall for it like the elderly, flying under the radar of anyone who has the skills to recognize it as a scam and report it?
It's the ad network's responsibility to never show scam ads, this has nothing to do with targeting.