Your logic is impeccable but one of the insane things about the advertising business is that they just ... don't really care that some huge portion of their expenditure is wasted on bots or scammers or whatever -- or, before that, people who went to the kitchen during TV ad breaks, or people who keep their eyes on the road instead of looking at billboards, or whatever. I mean, nominally, they care, but not in a way that would make them move their ad spend from a place like Facebook (which has a bigger audience, even factoring in fake accounts, better targeting tools, better attribution before Apple, etc.) to a relatively rinky-dink operation like Twitter.

I think if you could spend a decade changing Twitter to give a real-person guarantee, AND maintain an audience and content pool of elites in entertainment/politics/media, AND moderate it heavily enough that no advertiser will ever see their ad appear next to some groyper saying "actually I'm an ephebophile..." -- maybe then you could pitch advertisers. But whatever that site would look like it wouldn't look like Twitter.