The licence is as open as the project
From an interview with OpenBSD’s Marc Espie:
Federico Biancuzzi: Why do you think a lot of open source projects are modifying their license, limiting users freedom?
Marc Espie: Because they’re not doing their technical job in the first place, and playing with the license gets them more attention, in the short term. XFree changed their license because they thought they were not getting enough recognition. And they don’t get enough recognition because they don’t communicate enough. Also, because they have internal trouble.