The whole issue of not taking photos during the gig has well-known in Crim circles for several decades. But it seems that the rest of the world is indeed catching up on this topic, as this piece from Classic Rock magazine indicates.
Since King Crimson resumed touring the problem has largely abated with audiences broadly getting on board with the idea of waiting until the end of the show to take their snaps of the band.
Certainly, this KC newbie eye-witness to an unspecified performance on the current tour seems to have appreciated the no-photos please policy which the group has adopted…