Ignoring the implications of this for the moment, let me broach a related (and arguably more important) question: what do you do when you have multiple communities you interact with only on one platform, and suddenly that platform becomes intolerable for a subset of your community?
Remember when Tumbler banned porn? People migrated to other platforms like Reddit, and it died. Musk being a Nazi made twitter lose big enough chunks of their community to start Bluesky. Not big enough to do any real damage to the platform, but it still provided critical mass to a fledgling app. WhatsApp having a sketchy relationship with the US government boosted Signal. Sooooo, what is a good discord replacement?
I've never been a regular user of Twitter, pre or post elon era, but a lot of people I follow in other ways used to be very active on there and discussions would often spill over into other venues. That still happens a bit, but much less than before.