I've noticed this behavior with things like Pocket as well.
Is there any evidence you've found of any publishers intentionally trying to load assets in a way that would break with this because it is stripping some ad impressions?
I don't think so. Medium, for example, loads images on demand. So if you never scroll down, I don't think it ever renders the bottom of an article. I don't think it's malicious, just conflicting goals.
Is there any evidence you've found of any publishers intentionally trying to load assets in a way that would break with this because it is stripping some ad impressions?