(Quiet founder here)

I've been a bit breathlessly replying to comments and am now late for a weekly team meeting, but I just wanted to say that we're friends with the Tor Project, they like us and support apps like Quiet (and Briar, Cwtch, etc.) existing, and we're also part of a small circle of Tor fans who funded Tor to hire two full-time engineers to focus on onion services reliability after the DDoS attack last year, so we're donors to the project too.

Also, it's likely that distant future versions of Quiet (where we reach a large audience) will use Tor as just one way to connect. Gotta go but will respond more thoughtfully soon!