Commercial companies then built tools to identify most common steg, and AQ adapted by writing their own algorithms - which turned out to be not very good:
That really puts into perspective how huge Yo app is a threat to national security. It's only a matter of time until the NSA is intercepting Yos, or at least capturing Yo metadata.
So why aren't the terrorist evildoers hiding their few KB of text communications within multi-GB YouTube videos of cats and video games?