Here are some rooms you can join from the QOTO matrix server that have 100 or more users in it that I particularly enjoy:
#freenode_##agi:matrix.org
##cs:matrix.org
#physics:matrix.org
#Syncleus_aparapi:gitter.im
#Europe:matrix.org
#Nederland:matrix.org
#Occultism:matrix.org
Not sure what this is in reference to. But if they need a server to host a room they are welcome to use QOTOs.
@freemo @QOTO @GNUxeava
Many people left freenode for libera because of a hostile takeover at freenode. Only to end up having libera redirect to freenode.
https://die-partei.social/@hackernews/106559786455473255