I am watching one of the few official video talk recording from this year, and find it quite disconcerting when during a cutaway shot on the audience, the video focuses on 2 or 3 people where the closest person and the point of focus of the camera is clearing displaying a no photography sticker.
Those stickers exist for a reason, and it need to be respected. It's quite worryingly when even the organisers fail to do so and publish a video containing someone who didn't want to be photographed.
KTC