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Does a proof of concept need a use case? :)

Take a menu in a tourist spot, could have it go to both languages

So just keep scanning repeatedly until it gets you to the right menu?

Wouldn’t it be easier to just have the link the QR code points to show a language picker?

Or use the available language information from the device to guess the best language (and have a picker to change)

ok, so you're going to explain to people to scan it at different angles? absurd. this is like having a hyperlink go to a random destination.

real-world AB testing is the only thing I can think of

Not all questions have an answer that will satisfy you.

In this case, it probably exists because it's technically interesting, and for no other reason.

Although I can totally image a roulette style game played by people who like that kind of thing: one link leads to something nice like puppy photos, the other leads to something disgusting.