Moxie is a member of HN and of Github, and I have read his posts and his discussions on github, his contempt for the common user is obvious and abundant.
Signal is dependent on Google. That is a fact.
It can be hard to swallow, but many people, just read the github issue page, consider that insecure.
For many people security means not feeding their data into USAs corporations and intelligence services data centers. For many users, like me, if the choice is between USA and others, Id prefer in fact to feed my data to Russian or Chinese or Indian corporations and intelligence services. Then its not a matter of "oh my encryption is better", it doesnt make a difference, in that position, Telegram is for me a better choice even if its encryption is not as good - if it at least makes it more difficult for USA (but very easy for Russia) then its better than Signal.
Both Signal and Telegram suck, to various degrees in different forms, but the choice is easy to stay away from Signal and similar Google-only "secure" apps.