@zombiegenesis I think, at least for most posting not being for 'Canon' characters is more about how subjective it is to 'play the character right's since people absolutely read how these super heroes should be differently. Playing a favorite character can also ruin it for them. It is also not fun to be told 'that is not how x person should be played!' I also have not seen anyone expecting to be 'catered too' just be given the option to make their own thing. I also have not seen people demanding to be allowed to make something original just, more or less people going 'It sounds interesting but...' Hey, I could be reading the intent people have wrong though.
Except @Mr-Johnson His comment was pretty on the less kind side. Whether it was sarcasm or not.