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Re:Synchronous Messaging at Mozilla: The Decision by Mathnerd314 on Thursday December 19, 2019 @11:36AM (#21836409)
AFAICT they moved off IRC in response to Mozilla's announcement that it was being deprecated and also because IRC was terrible. They tried Zulip but concluded it wouldn't work well. There was already a community Discord server doing well so they set up an official one.

I suspect they might move back to Mozilla's Riot/Matrix instance once it's set up in production, but that hasn't happened yet.

Re:Synchronous Messaging at Mozilla: The Decision by steveklabnik on Thursday December 19, 2019 @11:58AM (#21836679)
This is sort of correct but also not, exactly. Most of the teams are on Discord, but a few are on Zulip. The Embedded Working Group is on Matrix.

In general, the teams are allowed to organize themselves as they wish.

Re:Synchronous Messaging at Mozilla: The Decision by est31 on Thursday December 19, 2019 @11:56AM (#21836650)
Zulip is still being used for official discussion though. Discord isn't the only chat platform Rust uses.