Don't rely on AI. There's nothing random about selecting the best looking pizzas.
Devil's advocate: it could even be the local board users have a local tradition of putting for instance pineapple on a pizza, and selected only the pizzas with pineapple. If there were only 5, that explains the selected pizzas. If they're all in the order they were posted, that explains the same order. I'm not saying this is what happened, and it's quite likely they were indeed just cheating, but it doesn't hurt to at least consider other options.