NEW: Over the weekend, Jack Dorsey launched an open-source chat app called Bitchat, which he promised to be “secure” and “private.”
He then later added a warning that the app not been tested or reviewed for security issues, asking people not to trust it as "it does not necessarily meet its stated security goals."
Security researchers are already finding flaws in it.

Jack Dorsey says his 'secure' new Bitchat app has not been tested for security | TechCrunch
Dorsey admitted that his new messaging app had not been reviewed or tested for security issues prior to its launch.

TechCrunch (techcrunch.com)