My take on free software projects and chatrooms:
I'm fine with Discord as long as it's bridged to Matrix. Like it or not, people already use Discord and it lowers the barrier to entry for participating in a community.
But if proprietary services are the *only* way to join a conversation about free software, yeah, that's not good.
Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.