Never said they would sell it. Just keep it for their own internal marketing efforts. What’s the difference? They just want to lock you into their overpriced hardware.
Not as bad as some but lock in is the objective. But once they have your private information they have it forever. You cannot get it back.
There is a big difference. You give one company permission to have your data which they will use only to improve service on devices you've bought from them because you chose to. . . permission which you can withdraw at any time and they have agreed they will delete the data they have and have historically done it when people have asked them to do so.
That is definitely different from other companies that SELL whatever they can find out about you, both overtly and surreptitiously, without your OK to multiple other businesses and will not stop or delete what they have. If you cannot see the difference, then you are completely blind.