Nowadays, the process of converting daily active users into monetizable data is trivial, so that's what everybody does, again regardless of whether or not you paid. When you think about the economics of it, your value as a commodity does not decrease just because you paid for something. No matter how much you pay for your subscription, your data is always valuable, and the only reason Netflix doesn't force ads on all their subscribers is because it'd look bad for them. But behind the scenes, do you really think they're not selling your interaction data just because you subscribe to the most expensive package? Monetizing users has always been a function of ease of implementation, not the out-of-pocket expense of the user.
I think this was implicit in my second sentence: "If you are paying, but at an affordable consumer rate, your likely still not entirely the main customer, especially for anything as complex as search over the entire internet."
This is correct enough. "p → q" does not imply "~p → ~q". In other words, if you are not paying, you are the product. If you are paying, you may or may not be the product. The adage does not say anything about this scenario.