this so called 'trend' has been doing it's rounds on other sites, and personally, i find it quite annoying. Having someone 'fix' your OC without your permission is the biggest slap on the face you can give an artist. Criticism albeit important, has always been something the author or artist can either take on board or ignore. By 'fixing' their OC your removing that choice, and thus, stunting the growth of the artist and the OC as a whole.