In my experience, it feels like 90% of Freenode channels have moved to Libera, 5% have moved to OFTC, and 5% have moved to something else like Discord or "just

In my experience, it feels like 90% of Freenode channels have moved to Libera, 5% have moved to OFTC, and 5% have moved to something else like Discord or "just use GitHub issues" or whatever. Certainly the number of moves to Libera is high enough that in practice the Freenode community/userbase is more or less also on Libera (turns out IRC clients can connect to multiple networks easily). So if you want the old community it's there; if you happen to want to target a different community anyway (and perhaps you were experimenting with these options already), Discord and Slack and so forth are there.