I once saw a rejection reason saying “Impossible to beat”
Apparently I replied a year and a half ago and failed the first run that came to my mind while reading the name of this topic. I once submitted a speedrun to New Super Mario Bros. DS, Any%, it was my first run and without video. This was during a time I still lived with my parents, and so I had to go eat dinner midway through. The run was rejected for "not being a serious run" because I mentioned I ate spaghetti in the middle of the run. Sorry for not submitting a 100% serious speedrun! Personally, I speedrun for fun, so I think that is a terrible and stupid rejection reason.
I once got rejected from a speedrun because I didn't start the time when it should have
Previous phas mod banned shade, coz he could, 2 hours full game run went to trashcan (and solo category is still empty btw, not much changed it seems)
My first run was rejected with the reason being: "kek"
I will never get over it lol