They, like Facebook, are big enough that they don't need to sell data in order to monetise it. This doesn't make their swirling vortex of personal data extraction less creepy.
That's literally their business
Google may be using the data for their own benefit but they don't sell it to third parties.
Yeah that's like their entire business model. They use it to sell ads, etc but they won't sell their most valuable asset.
They sell ads that they target based on your data but AFAIK they don't give this data to any third party (except gov agencies of course like all US companies)