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We can absolutely expect Google to be a gatekeeper for advertisements they run on their platform. These aren't just middlemen, they're scams.

We shouldn't just be used to Google being allowed to essentially run infinite scams. Remember, they directly profit off the scams.

Its like if I had a billboard and then let someone put an ad up that said "give me all your money and you'll live forever!"

Am I off the hook? Why, lil ole me? I just run the billboard!

You might then say, well, obviously looking at every ad you accept is far too onerous! Its not like a billboard, because the billboard owner must see all the ads!

Which then I would reply - why is Google entitled to a business model like that? If they can't reasonable run their business in an ethical way... Perhaps they shouldn't run it all.