Readability is in Safari, so many (many) millions of users. There are extensions for basically everything, bookmarklets for everything else, and many news-read

Readability is in Safari, so many (many) millions of users. There are extensions for basically everything, bookmarklets for everything else, and many news-reading applications use the same scripts to render their 'text' views. And popup / cookie blocking has been standard (not just common!) for a while, so I assume you didn't mean that.