For ex. in a lot factorys, is is forbidden to make pictures (and movies). So maybe you just don't have access to such areas. In Switzerland pen cameras etc. are just forbidden.
In fact, pre smartphones more or less, bringing cameras into even an office workplace was generally pretty controlled. Still is under some circumstances.
I banned them from our office and while using work-issued computers. There’s no circumstance here in which someone should be working with a personal camera aimed at their screen.
Recently someone showd me a cellphone picture from something he saw in our company. He was not brave enought to make a screenshot (with the companys computer), so he made just a photo with his cellphone from the screen. So, this is a thing.