I keep noticing problems that are much too difficult to be part of any school class (such as tough olympiad-type solid geometry questions) posted as homework. The posters do not appear to be looking for limited answers or hints, and in some cases they add bounties to get the problems solved more completely. The OPs sometimes have difficulty in English.
Is it possible that the posters see the tag homework and think it is an English equivalent of exercise, which does describe the questions? Is there a need for an [exercise] tag? It could apply to a lot of the competition-like questions that are posted.