I really wonder what the incentive is for someone who just took the exam to go and spill the beans to someone else in another time zone. It takes months and months to prepare for this thing, and now you’re going to go help another person pass more easily while waiting for your score. Perhaps you can pay a friend in another time zone to take the exam and divulge the questions for Level 1, figuring that they’re not going to go on to L2 and L3, but why would someone taking L3 want to make it easier for their some other guy to pass, when it’s taken at least a few years of their life to get to this point?
Money? Maybe, but it better be a LOT of money.
And remember, for a lot of people, even to get to the point where you know the material enough to report what is needed to solve it requires an enormous amount of study.
So perhaps the time zone issue is a bit of a problem at L1, but I find it difficult to believe that people studying so much for L1, L2 and L3 are going to want to make it easier for other people to pass the exam without doing similar amounts of work. It’s got to cost a LOT of money to get people to throw away all that effort, and people with that much money probably have other attractive options for their lives anyway.