We regularly confuse irrevocability of licenses and actual availability. The former is something we here probably agree cannot not make sense (once the beans are spilled there's no going back, you can't withdraw intellectual property: what you gave is now irrevocably tied to the recipient, they gained knowledge). The latter is clearly wrong: there's no such thing as universal availability. As humans behinds keyboards we pretty much decide in any way we want what part of (information about) our knowledge we share.