Down voting other people's works doesn't make your works better. It just discredits the Challenges.

Well, thankfully that's sortof only a Reddit thing but I get what you mean 🤣

Are you sure it's really a thing though? Some challenges I enter are full of very low quality images and if I am kind and give them all a decent vote then when I see some fantastic images and upvote them I don't feel they get the credit they deserve! So if I don't think much of an image I vote it low and then there is a decent contrast when I like an image that I vote high. I think there are a lot of people who naturally think their creations are better (because who would enter something they didn't think was great) and then when their image doesn't do well they think they are being downvoted so that others can win... If you think about it if everyone downvoted everyone else and only a handful of people were fair then voting would still work very well - the best would still win. I really think naturally everyone thinks their work is really good and then take a bit of an ego hit when it doesn't rate well - me included!