You could reasonably argue that they're not cheating, indeed they're being very behaviorally revealing and you do understand everything you need to understand about them.
Too bad for them, but works for you…
I'm imagining a hiring workflow, for a role that is not 'specifically use AI for a thing', in which there is no suggestion that you shouldn't use AI systems for any part of the interview. It's just that it's an auto-fail, and if someone doesn't bother to hide it it's 'thanks for your time, bye!'.
And if they work to hide it, you know they're dishonest, also an auto-fail.
Too bad for them, but works for you…
I'm imagining a hiring workflow, for a role that is not 'specifically use AI for a thing', in which there is no suggestion that you shouldn't use AI systems for any part of the interview. It's just that it's an auto-fail, and if someone doesn't bother to hide it it's 'thanks for your time, bye!'.
And if they work to hide it, you know they're dishonest, also an auto-fail.