I think the bigger problem is that the questions are currently in plain text, which, since they require a human to write and once solved are solved forever, mak

I think the bigger problem is that the questions are currently in plain text, which, since they require a human to write and once solved are solved forever, makes the approach as implemented a sort of quixotic reverse captcha. If they switch to image based questions, the potential problems for human solvers are magnified.