I think “hosed by Apple” is an unjustified summary. More like, “the maintainers of pf released their code under a very permissive license, and then one or more of them was unhappy when someone else took their license terms at face value and used their code in strict accordance with those terms.”

If what the pf maintainers really wanted was to use a GPLv2 type license, and instead they used BSD, and now are unhappy about the consequences, I can’t see how that’s Apple’s fault.