Lol if you are worried about privacy then you shouldn't be using any Internet service! Do you really think they are any different to Facebook, Google etc?
Regarding ads, if I am going to see them at all, if prefer them to be relevant to me. If I want to look at questionable stuff, I start an in private browsing session in IE.
The only place that I can guarantee privacy online is this site. I have been asked to sell data a couple of times. I of course refused. 😊