Part of it is the fault of the posters. Many of us are too lazy to realize that there are still lots of sites that allow the full posting of articles. Because many (like the NYT, Wash Post, LA Times, etc) allow only excerpts, many posters get lazy and they excerpt everything they post.
If you cut and paste from the original (always include the URL for reference) those annoying pop ups don’t come with the material. Yes, it’s a little more time consuming, but you eliminate pop ups.
One of the most annoying sites is Daily Caller. The pop ups there will drag your computer to a standstill. But, if you copy and paste just the text to FR, you can get the whole story without any ads. And Daily Caller allows it.
Believe it or not it is against the law to plagiarize someone Else's work.
It's why there is an excerpt button on FR now.