To be fair to the site, anyone can upload and it looks like those AI photos are recent submissions (may even be a HN user). If you scroll just 3 rows down it's all dumb fluffballs
For me it makes it significantly easier to communicate with business and explain things like technical limitations and data requirements. It also helps with collaborative design on complex projects, making it clear where we're failing to meet data requirements
It isn't pre programmed to what I understand. All it does is guess what your drawing looks likes based on other peoples drawing, and continues to guess until it is correct. So when you drew a car with no siren, it's guesses could have been truck, car, police car. Since it guessed police car, it got the answer correct. The program wasn't told you had to draw a police car. That would be silly. Why would they create this and lie about how it works? What would be gained?