Earlier quoted context omitted.
_Everyone_ is collecting our data nowadays. Who's left to sell it to?
Not true. Google collects your searches. They don't sell your searches, they sell whatever they infer from your searches (your compiled and quite vague profile and I know, because I interacted with their AdSense platform), because they'd be stupid to sell your actual searches, since that's their most valuable property. Does anybody else know your search history? Besides the NSA, whom I assume have access to all US-ho…
Not because there are no potential issues to discuss around ad-funded free services and data aggregation, but more because it's like clickbait (in that it oversimplifies a complex issue for emotional effect and makes discussion of actual issues more difficult).
Using algorithms to build a general profile in order to increase relevance is not the same as "selling your data". They sell access to your eyeballs in much the same way as a broadcast TV station or free alt-weekly does. The main difference is that by getting some sense of who you are and what you might be interested in, they can decrease (in theory) the amount of irrelevant ads that end up on your screen versus the traditional methods of just blanketing things with general ads or using cruder demographic info.
Lots of companies flat-out do sell your data, either in aggregate and somewhat anonymized or in full. I've not found anything yet that leads me to believe this is how Google runs their advertising business. To this day, my main concern with Google isn't so much with Google as it is with a malicious third party somehow gaining access to the info Google has on me.