Same here, I'm not gonna pay to read a blog post.
In my case it is Quora. I find it annoying that whenever I read an article in mobile, they force me to install their app :/
Medium, Quora, and lest we forget, Pinterest. I hate how much Medium tries to get me to sign in to read stories or to upgrade to read more than 5 articles a month. It gets tired when I have to ration my free articles for the month like it's Unobtanium, and we all know just how low-quality most Medium articles are. What I do is save Medium links to Pocket, which somehow doesn't count against my free 5 articles.