Ye could both check out even the voting pages or the winner announcement pages of past contests. My experience is that the sentiments expressed are genuine and reflect the good natured tone. While, clearly, effort is put in to make the stories the best the writer can, the overall is about participation and not proving superiority. I've won a few and done more than one Norway in the Eurovision (0 points) amd, to be honest, will sometimes defend more resolutely those that fared miserably as things I'm glad I wrote. I can say it gave me a focus to get writing, get stories finished, get on to the next thing. It can also be interesting to see the widely divergent takes on whatever the prompt might be.