[aorav]

They don't (sell your data directly), explained by Google itself https://safety.google/privacy/ads-and-data/

Of course it's up to you how much you trust what they write there.

[xbmcuser]

It's in Google best interest to not give others the data it collects as it can rent out the results multiple times to multiple customers. Where as giving data means they earn money of it one time.