What's especially frustrating about all of these "Signal could flip a switch and steal everybody texts!" histrionics is that if they were interested in doing that they... wouldn't work at Signal. They'd go join/start the hundreds of other companies we've heard of in the past few years that have stored/leaked incredibly sensitive data with an insignificant fraction of the effort Signal have put in to establishing their credibility (the TeleMessage scandal being just the latest). People should hold Signal accountable, constantly, forever. But the baseless FUD is frankly hysterical from a forum of ostensible technologists.
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Circling back up. Article author: Twitter might be untrustworthy and could bruteforce your keys. Use Signal.
Me: That's unreasonable. You also have to trust Signal.
Your answer just now: Why are people picking on Signal?!?
In fact, what the world really needs, rather than 3rd-party controlled encrypted messaging solutions like Twitter and Signal, is public apis for public key cryptography on non-trusted infrastructure, not tied to single groups. Everybody knows this. The reason that we instead have bodies like Signal -- a company that just so happens to tie every encrypted message to a real phone number and real human identity for no easily explained reason -- and the reason we have people who surely know better defending bodies like Signal in public, is an exercise left for the reader.