[6Typos]

>Actually, banning encryption apps may be good for privacy, because you never know if the app maker made some backdoors in their encryption method and he already sells your information to somebody.

IMHO, the answer to this lies in Open Source + reproducible builds/compilation. Not in banning/not using apps that promise privacy.

If what you're trying to achieve is awareness about the possible false sense of security (when not appropriate), then the answer is educating people about it.

EDIT: Typos/Grammar.