When I forget to sign in to YouTube, I see the same pattern, shitty ads that are clearly only allowed because otherwise YouTube wouldn't have sufficient ad inventory to meet their internal KPIs.
The reality is, of course, that Google and its ilk doesn't give a single rat's ass about people falling from scams or getting infected by malware. Scams and malware pays better than "ethical" ads (to the degree that such a thing exists). It's a travesty that there are apparently no laws against their behavior.
https://oig.hhs.gov/fraud/consumer-alerts/fraud-alert-nation...
When you heard the vocal equivalent of large type text every real person knew that it was time to get grandma away from the TV but... the people at the TV network didn't, law enforcement didn't, your congressman didn't, anybody in a position of power didn't. And no wonder people feel cynical, hate the media, distrust the cops, distrust politicians, feel "the game is rigged", etc.