If Y-combinator, given that they own that data, or anyone else FTM, is that motivated to scrutinize my past, it's a bad culture fit already.

But you bring up a good point: my online comments are likely to be matched and monetized against me as much as they possibly can - by superintelligences, to boot - iow, in ways we are incapable of imagining, given that we are not AI. And it's no doubt already happening a lot.