> they have to have your app installed Note that for school kids, a significant user of museum services, my kid's school issued ipads can scan any QR code and

> they have to have your app installed Note that for school kids, a significant user of museum services, my kid's school issued ipads can scan any QR code and they use that in class, in fact its the only time I've seen someone "in the wild" actually using QR codes, but getting an app installed requires an impressive level of government bureaucracy and leadtime (basically once a year at curriculum review time you could get a new app added to next year's standard system if there's storage space and the review board approves, etc). They rolled out unlocked, which led to nothing but playing games, then went thru a phase of blacklisting but there's too much whack a mole to list everything to block, now they're pretty well locked down.