I must have less shame than some people: I regularly post drawbles I did in five minutes. (Somewhat crushingly for my artistic ego those often get as many or more comments than things I worked on for many hours too! which I sort of get on a social level, because they are often more interactive stuff, but still.)

Anyway even with participation requirements, they didn't have to be so murky about it. I mean, there always were participation only spaces, like I remember a mailing list way back when I was in TS fandom that had posting requirements, so that is not new.