WTF is this shady-ass sh*t. Way to "secure users' privacy," Facebook.
From the sound of Onavo's App Store reviews they are using deceptive marketing of the "Your phone is infected, install this now!!" variety. Yet they have a lot of positive but suspiciously brief reviews balancing them out. So Facebook bought a company that MITMs unsuspecting users for profit, using scammer marketing techniques and fake reviews to drive installs, then leverages that to knife babies. "Don't be too proud," indeed.
I hope there is cause for Apple to remove this app from the App Store (like deceptive marketing or exploitive practices). Or for a bunch of us good folks to leave negative reviews. These guys depend on informed people avoiding these apps and not leaving reviews.