I'm sorry if this hurts your beliefs, but in what way are aggregated and anonymized data exploitative? Every "offline" store does it. How do you expect businesses to make profits if they can't look at what drives their revenue without bothering every single customer with consent requests?
Big Theta isn't "average case". It describes an algorithm with the same asymptotic lower and upper bounds. How would you even formally define an average case, when the result depends on the input?