I think of this in terms of value rather than acceptability. When I am browsing the Internet, do I want to see ads? Do they do something for me? Generally, no. They may be beautiful and creative and all that: that’s great. When I want to look at pretty pictures and clever videos, I will be searching for them. But if I am not searching for them, I don’t want to see or hear them. I prefer to be in charge: the same content may be ham or spam, depending on the context.
So, the idea here is: ads enable certain business models. But at the same time, they have costs. I remember @matthias saying that 90% of bandwidth is used to convey ad crap. If we did not have that, we could connect the world with a leaner, cheaper, more inclusive experience: no need for 5G, and probably for 4G as well (I have no source for this). I am interested in a rough cost–benefit analysis of ads: ads themselves, I would argue, are almost always on the cost side, even when they are beautiful, because they stand between us and the content we are trying to get to.
On the other hand, if you go to events like La nuit des publivores, ads become a good thing, the very thing you are looking for.