It's really simple: if I can't read your menu, I'm not eating. Goodbye. IIRC there's a law here that mandates a menu visible from outside the premises, it isn't always followed to the letter, but but most places comply, and it's a great way to avoid unpleasant pricing surprises.
Same with paying. You don't accept cash or credit cards? Goodbye. You only accept apple pay or some other nonsense payment system? Goodbye. And you'd better advertise your accepted payment methods outside if you want to avoid unpleasant surprises.
There are plenty of restaurants/bars out there. I'm not spending money in any place that clearly doesn't want me there.
And if you really insist on a silly QR menu, then at least include a human readable version of the URL. Seriously. It's not that hard.
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