Re the ban on photography in museums, I think I have found another explanation.
We are off to Luxor for a couple of weeks in early summer, before it gets too hot. Reading the guidebooks, we were initially surprised by the high cost of camera and video permits for the museums, temples, and tombs.
On reflection, however, the Egyptian system of permits has the advantage of making these sites more accessible to those on moderate budgets. I have no doubt that the scale of camera and video permit charges is very carefully calculated to maximise tourist revenue. And why not? We will have to be very careful about spending. Without such permits, entrance fees would have to be set higher, and could have made the whole holiday uneconomic for us.
I am sure that in the museum world the economics of camera and video permits is established and well known. I would not be at all surprised if the museum on Murano has a similar system.
The permit system has the double advantage of maximising revenue while enabling those on modest budgets to enjoy their holidays and still have access to all the important venues. I wish simple economics would always produce such an excellent result.