I had a quick look at the pricing page, and the "free" version seems to be ad supported (the paid version says "no ads, forever"). Though the FAQ on the homepag

I had a quick look at the pricing page, and the "free" version seems to be ad supported (the paid version says "no ads, forever"). Though the FAQ on the homepage says it doesn't sell information, I'd like to know what ads are shown in the free version and what kind of tracking (if any) is used by the advertising network used by the service.