I don't understand your position at all (and I don't mean this aggressively, I just can't get myself into a position of understanding). From my current perspective you seem to be absolving Google of any responsibility for, literally, their product.
My reasoning is:
Google have created an advertising platform. It is their raison d'etre; their entire millions per hour profit engine. But they only built the easy, profitable half because there were / are no regulations to enforce the responsible, difficult half.
They built the half that allows anyone with the money to put something on their platform. They didn't build the half that makes sure that they're not helping scammers, con artists, and outright criminals from reaching the global audience that their wonderful, profitable, scalable platform enables.
They should be policing it on their own to an extent that obvious scams and fake banking websites and clickbait should be detected. Even just to appear to not be a crime-facilitation platform, which they currently are.
To me it feels analogous to Microsoft and their commitment to security of Windows. It's not a priority because it's counter to profitability. Privatise the profits and socialise the costs.
If they can't control their own platform, they should not have the platform. It is not a mature enough product to be released upon the world. It is Frankenstein's monster, left to roam.
I would be supportive of legislation that outright banned advertising with Google until they were able to provably clean up their act; if their product was market-ready.
Which three letter agency said that an ad blocker was a required layer of security when browsing the web? There's a good reason: Google. If the Internet is full of scams, who is most responsible for its proliferation?
(I have a massive bias against advertising, so that heavily colours my opinion. I also understand that advertising is inevitable, but it should be held to a much higher standard than, well, the none that exists)