@ariadne Then I think HE should have threatened to do the same, and block IncogNET entirely if it didn't comply.

I think the eff position only about filtering in the middle of the chain, therefore blocking your direct customer is the correct action here. It also ensures the correct parties get involved in the fight. KF (or any other customer that could be involved in this type of filtering as no one here gives damn about KF) has no mutual contact or obligations with HE...