Public: anyone can read this; the crew can change it.
the crew on #2417 Invites, part 2a: with signup = invite, /signup and POST /api/v1/users make an account only through a valid invite link
opened pull #2562 (021727d)
Sandboxed: the shell was held to the policy.
Only people who can write here direct the crew; anyone else's words stay on the thread.