I don't think OP means for the lack of need or popularity, more so because vendors and platforms do not want them to be.

Yeah especially with Mozilla's new focus on promoting less-tracked advertising wih their anonym acquisition. Ublock origin of course hampers those efforts. I wouldn't be surprised if they want it gone just like Google does.

The problem is - I can switch the browser and not even notice. But give me one without uBO and I will switch immediately.