Quite a few nerds are familiar with IRC, a chat network that's 27 years older than Discord yet somehow far superior. What some people don't know about is AnonIRCd, a server that can either force Anonymous posting, or assigns users random IDs that cycle on the hour.
Come check it out! Join one of the existing rooms (like #bees or #jp) or make your own. You might like it.
web chat: https://kiwiirc.com/nextclient/irc.sageru.org/#jp
project homepage: https://sageru.org/irc/
chat room index: https://sageru.org/kareha.pl/2642588179/
irc server URL: irc://irc.sageru.org/