My own personal conspiracy theory is that Flat Earthers, Anti-vaxxers and all the other "Facebook boomer" conspiracies are just a strategy to discredit other "more real" conspiracies: if you believe that 9/11 was an inside job you're bundled with people that believe that Earth is a frisbee and smart people don't want that so they keep themselves from exploring anything else.
Also aliens fucked apes and that's how we got here.
Yeah, It's like the theory that Gates put microchips in the vaccines. First, your phone already does the job. And second, the actual conspiracy going on is that billionaires funnel their money through charities they own, and then make donations to influence the media and scientific research in their favour.