Oh no, the criminals might find out about your disgusting eating habits! The horror!
Seriously though, what kind of damages might you as a customer expect to see from McDonalds kiosks getting hacked?
There are some comments here claiming that their experience with McDonald’s order kiosks in the US makes them feel this is unlikely to be hackable, but “employees regularly leave them unlocked” sure sounds like an invitation for someone to find other hacks.
when the credit card issuer fraudulent credits the charges back to your account, you no longer have any (meaningful) damages.