It is collecting dust for 99.99% of users. You've linked me to a commit of a merged pull request. That is not an indication that any of Yahoo's users are using this code (unless you count the developers). Maybe Yahoo will actually make their end of year deadline for "all users" [1], we'll see. They have less than two months left to do so. My knowledge of Google's end-to-end attempt leaves me skeptical, and not because this is any sort of a technical challenge, but because it's a political challenge.