There’s no way they’d risk their reputation by serving a different menu to people depending, say, on the OS. Also it’s probably 100% illegal where I live.
Also, the QR menus I’ve seen don’t connect to the actual ordering process. Waitstaff come over to get the order, then they punch it into the POS device that tallies the bill. So maybe they could have dynamic pricing day to day, but not from customer to customer
From a quick check on my government's website:
- prices must be displayed outside and inside the restaurant
- the prices can't be different depending on where they're displayed
- the displayed price must include taxes and service fees
That's enough to guarantee there's no possibly legal price discrimination. Not a single mention of "mobile OS".
Can they refuse to allow an adult to order from it?
Actually children menus are sometimes marked as < 12 years old now that I think of it. Not sure if it’s legal, but I don’t think it would be enforced.