Comment by mikkupikku

"We don't sell your data" translates to "we sell OUR data about you".

They would never admit the data belongs to you while selling it. When they sell it, they declare themselves the owners of that data, which they derived from things you uploaded or told them, so they're never selling your data according to their lawyers.

Another thing they like to do is sell the use or access to this data, without transferring the legal rights to the data, so they can say with a straight face they never sold the data. Google loves this loophole and people here even defend it.