Cheers, I was thinking a Discord style platform would work well but don't want to swap one closed system for another. Matrix looks good - with different rooms in spaces, public or invite only access, email only sign up. One issue with signal is also that everybody uses secretive usernames - not great for friendly neighbourhood community chats. But it looks like some Matrix clients have multi-account support, so that could fix that. Do you know if theres any sort of cap on user numbers? I'm envisioning around 50-150 users for events/requests/etc.