I never said the questions were approved. Selective reading on your part? The questions are grouped by subject. The most popular subjects are then gone through for the best question, I.e. one which has not been recently asked, are clearly worded and are not offensive.
The panelists do not know what might be asked but they are not stupid so prepare for popular and current subjects.
Finally, an amusing question is chosen to lighten the mood a bit.
Why don’t you apply to be on yourself than you will see first hand how it works instead of repeating what you have read elsewhere?