Corollary to "If you are not paying for the service, then you are the product being sold"

This is totally unresearched first draft post, so it might contain some gross misunderstandings. I am going to look into the history of that quote and my layman economics and update my notes below at some point.
My highly unoriginal observation on the pithy one-liner:

"If you are not paying for the service, then you are the product being sold"
Is that it follows that it is in the best interests [1] of you  to be a good quality product.

My reasoning follows thusly: