IRC plus GNU Jami are still freedom respecting zones! I sincerely hope all this age verification crap causes cypherpunk FOSS solutions to grow in popularity.
Matrix has become invaluable for dozens of my hacker friends. We ditched Discord almost a year ago and we have no desire to go back. Besides having high quality e2ee voice/video/screensharing (thanks LiveKit), we collectively spend 10x less for the functionality and keep our data in Switzerland. No ads, no one getting their accounts hacked with QR codes, ultra-granular space/channel settings, multiple choices for client implementations, and end to end encryption enables sensitive discussions that would have previously been curtailed. The identity verification is greatly appreciated although our new users do have some issues getting set up with multiple devices, but it's no more complicated than multi-device WhatsApp. Matrix is ready for prime time.
Just remember that systemd added age verification in Linux without anyone asking.
There are freedom respecting Linux projects, but those lead by redhat\ibm employees (past and present) don't.