Well, we can all speculate to no end who "ratted" out FE.org, but I don't think it matters too much in the end. It just was finally the right person who didn't mind being a rat.
If I had to make an educated guess, I would say it's been the recent article about Adywayn's edit where they mention FE.org and that you need to "own the original to download ANH:R." Either that, or someone else was just searching around randomly and stumbled across it. To that "special" rat individual: