That's fair. I take automatic backups of the sheet, such that if access to that is eventually lost I can republish via another method.

Discord is used for the simple reason that the current goal is to gain as much traction and participation as possible. The Rocketchat server I host, and the IRC channels I could have used would both acted as barriers of entry to a lot of possible participants.

Perhaps with time I can push for a migration to a solution I host. For the moment I'll stick with these tools, and plan for their failure as best I can.