The author Matt Cruze says "Any threat of legal action is a big deal. I am a one-man operation. If I were sued for whatever reason, I would find it very difficult to defend myself, even if it was without merit. I would be risking my personal life to maintain a tabbed news feed for users. As much as I’d like to be your Robin Hood, I just can’t do that to my family."
Bizarrely, when he asked Facebook why they don't also threaten Ad-Block, the Facebook rep claimed to have never heard of it."