When you go to "view all leagues," not all user-created leagues are currently listed. I understand some leagues are invitation-only. But a user (like me) may still want to follow what is happening in those leagues or maybe even notify the commissioner if they hear about a future opening and want to join. Perhaps those leagues could be listed with "invitation only" replacing the number under Available Teams.

I think if the owner has them set to private they won't show

Private Leagues should have on maybe the league page who the owner is, it would help GM waiting lists etc...