Twitter co-founder and erstwhile CEO Jack Dorsey has started yet another new app — and this one's got an embarrassing secret. As TechCrunch reports, Dorsey's new open source messaging app, Bitchat, is supposed to be decentralized, private, and secure. There's only one problem: the Bluetooth-based app, by the tech founder's own admission, is probably nto all that secure. "This software has not received external security review and may contain vulnerabilities and does not necessarily meet its stated security goals," the Bitchat GitHub reads. "Do not use it for production use, and do not rely on its security whatsoever until it has […]