Clarification, Google doesn't sell the info itself, it guards that jealously, they sell targeted advertising. They say "we can make sure your advert gets to the people who want your stuff" to the ad companies and sell advertising space on that premise. The ad companies don't know your political leanings, but Google does and makes its money by targeting you with ads relevant to that and other aspects they've identified about you.

Google/Meta don't sell the info specifically because that info is how they provide their "unique" service.

Sing in chamber choirs

Kkl

Is always a trap, just not necessarily the trap we expect.

The comments of the article make some good points too. The premise is both more complicated and less interesting than the more we'll received titles, and it just seems much less fleshed out.