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Not difficult to understand at all... Except I was never addressing selling data in this conversation; I only addressed harvesting data.

Again:
They need data in order to make their services work. On some data you can opt out.
If you are not interested in their services, well maybe you choose the wrong platform. But I’d say the alternative is much much much worse in terms of privacy. Your data are Google core business
 
Privacy and security principles are significant factors, and our household uses Apple devices exclusively. It was not until we had guests with Android phones, whom we were allowed to use our Wi-Fi, that we started seeing ads everywhere about what we were talking about. Leaving Siri on is (or at least was) useless for digital marketers, but having someone with Instagram, Whatsapp, or YouTube open in the background on their device is a blessing. I believe that even after the Android users are gone, we somehow remain linked for good to the advertising target audience.
 
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