For me, every web page would be improved if it had no ads. Ads just get in the way of whatever my purpose was in going to that web site. How big sites like YouTube can support themselves is an important question, and maybe one must put up with ads, faute de mieux, but that does not change the fact that they are invariably a bad experience for me. The number of times I’ve hit mute on a particular middle-aged prat launching into his spiel about how “The funeral industry has been ripping people off for—”!
The only quasi-exception to that is when I specifically look for a thing that I already know I want. But that’s stretching the meaning of “ad” to include things like a company’s own web site, or a shopping site like Amazon. I only see such sites when I specifically go there. They do not come to me, interposing themselves between me and what I want to do.