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Are you sure those companies aren't still selling your data? Especially in your example of youtube premium... I'd imagine youtube is selling the data about which videos you liked, watched, etc. The premium part may just be that you don't see any ads

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I don't think Google "sells" any data at all. They use data they have to sell advertising space, and in the case of Youtube I'm sure they use it to inform different platform decisions, but it doesn't ever leave Google.

Their huge amount of data is their strongest competitive advantage.

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