That is just a silly question. Of course nobody will go through the trouble of opening their settings just to enable ads. But if they are on by default many people (including me) won't mind them enough to bother turning them off again.
Its only silly if you look at it from one perspective. Looking at it from the customer's point of view, its quite reasonable. Looking at it from the business point of view, its justifiable experience degradation for cost of doing business.
I don't think as a user its unreasonable for me to expect software vendors to do the right thing for me. Whether they do it or not is their choice, I'm still rightfully allowed to complain about it.
As a user I want them to do things that make business sense, because I want them to have the money to keep developing the browser. If that means an occasional minor inconvenience for me I'm okay with that.
