The best thing about these kinds of contests is they draw all the cheaters & alt accounts, making them easy to identify.
I know the contests are born out of purely good intentions, but as we've also seen with the pizza and art contest (as well as all the price prediction contests & free raffles), they attract a lot of users without consciousnesses. Anything that has to do with free money will attract scumbags who won't respect the rules -- that's just how its always been, long before bitcoin.
Sometimes they're not even aiming for money, but for possible received merit when they submit their work (whether it's their own work or stealing someone's else). And these days we also have to check whether the image is AI generated.
..you know.. like.. working on the mythical supposedly 'new' forum software.
It's not mytical since it's source code and progress can be seen from
https://github.com/epochtalk.
But don't ask when it'll be completed or replace current software (SFM).