They're not selling your data. It's much worse...

Video added on 29th May 2022.

Note: playing video here allows YouTube to track you. View on YouTube or Invidious (tracking-free).

A great explanation of real time bidding and how your personal information does get shared by google (and many others) with thousands of third-parties, some in China and Russia. Whatever sneaky language they use to reassure you, this is the reality of the online advertising world.