Separate information on open communication channels and volunteering
As it is, the information on public mailing lists and chat rooms are under the "volunteering" chapter. This is something of a barrier because "volunteering" has implications beyond just the desire to ask questions or send drive-by patches. I haven't volunteered to help any open source projects in many years but I've done a lot of work and sent many patches.
I think any communication channels that are generally open, like mailing lists and Matrix/IRC channels, should be described separately from volunteering and the communication channels which require formal "volunteer" status with LDAP logins and all that jazz.