I would say that in comparison to the standards used for top ML conferences, the paper is relatively light on the details. But nonetheless some folks have been able to reimplement portions of their techniques.

ML in general has a reproducibility crisis. Lots of papers are extremely hard to reproduce, even if they’re open source, since the optimization process is partly random (ordering of batches, augmentations, nondeterminism in GPUs etc.), and unfortunately even with seeding, the randomness is not guaranteed to be consistent across platforms.

No, the server is on the github account linked above as well. The repo is here.

Signal however doesn’t federate and does not generally support third-party clients.

I used to do something like this before Signal became a thing. We used to use OTR via the Pidgin OTR plugin to send encrypted messages over Google Hangouts. Funnily enough, I’m pretty sure Pidgin supports Discord, so you could use the exact same setup to achieve what you described.

It was pretty funny to check the official Hangouts web client and see nonsensical text being sent.