[comex]

Performance. A museum visitor may not have a good internet connection, so any solution that involves uploading a photo to a server will probably be (much) slower than client-side detection. There’s a thin line between a magical experience and an annoying gimmick. Making people wait for something to load is a sure way to cross that line.

Also privacy. Do museum visitors know their camera data is being sent to the United States? Is that even legal (without consent) where the museum is located? Yes, visitors are supposed to be pointing their phone at a wall, but I suspect there will often be other people in view.