Sorry, but I can't find any sign of an "Open Messaging Service" by Yahoo anywhere. I can't find clients, I can't find sources. The OP doesn't cite a single post but brazenly makes broad assertions with nothing to back them up. Citations, links, anything, please? Edit: Apparently the post is fictional. I didn't realize this when I skimmed it.
"Two years ago Edward Snowden released a slow trickle
of highly damaging revelations about the NSA and the
erosion of privacy that affected people not just in the
USA, but across the world."
Sorry, if that wasn't clear.