No of course not. Do you mean this debugging interview in particular, because it could potentially be useful work fixing a real bug for them? To be clear, it i

No of course not. Do you mean this debugging interview in particular, because it could potentially be useful work fixing a real bug for them? To be clear, it isn't an extant bug. I think the way they do it is they take an interesting (but fairly straightforward) real bug that they fixed at some point, and they back out the fix.