This is not just about "better ads" - though I don't understand the term better anyway here. This is about profiling people. Ads are just one benefit here. Profiles can be sold to get a better idea of the potential customer base.+

> It basically just powers product discovery in a giant global marketplace.

That is also incomplete. See how profiling led to ICE finding people - and ICE has a proven track record of executing US citizens. That is also a fact. It does not mean profiling led to the death of the people here, 1:1, but it meant that it is a contributing factor to the build-up of government troops killing people (which is very similar of Europe 1930s by the way).