Because if you want to influence the voting patterns of a population, knowing as much as you can is useful. Search history + TikTok + FB would give you unbeatable datasets that you could use for the lifetime of the person. Take a dataset now, add a decade of AI progress and I’m pretty sure a nefarious actor would be leading many people around by the nose. Not all, but 5% would move many elections.

They wouldn’t even need to learn all that much about you as an individual. Just enough to match you with a cluster from their own population that they have infinite data on.