Hm. Museums can restrict cameras. Public buildings in many cities forbid professional photography. I can see it - food has many aspects, including the artistic. Its ephemeral (you eat it) but so is any performance art. I don't see any logical inconsistency with chefs protecting their work.
I'd like to mention that the headline is a bit misleading. It's not about taking pictures of works (or people, for that matter), it's about <i>publishing</i> these pictures without consent of the creators of those works (or the individuals pictured in the photograph).
If they object to a photo, I imagine they would be apoplectic if someone analyzed the contents of their doggy bag and reverse engineered the ingredients.