Just out of curiosity, why be strict about one type of of non-sourced content and not the other? I’ve seen conversations and entire posts lifted straight from reddit (as in, people are posting other people’s words) without a shred of credit.
For me it’s honestly not about the sourcing. The sourcing is just the fucking cherry on the cake when it comes to the whole reposting/editing fanart issue.
Because I’m not sure about you, but a lot of artists (especially Japanese ones) want to keep track of their hard work. How would you feel if someone cropped a bit of your art without permission, slapped a bunch of textures/unrelated quotes on it and put their name on it? Even if they said that you drew it, do you want to be associated with whatever statement their edits make? If you don’t care, would you understand the feelings of people who do?
I’m pretty sure people would be unhappy if a story that they spent hours on was edited and reposted elsewhere with no credit except a link to the front page of fanfiction.net. I don’t approve of this either but I don’t see it happening a lot.
I know jack shit about Reddit but if there’s been wank about that kind of crediting for posts I haven’t heard about it - whereas there has been a lot of friction over the years between western/eastern fandoms over editing and reposting of fanart and the misinterpretation of it. People I know have been bullied, fanartists I know have shut down their websites because they were scared of what people were saying, and lots of talent has been hidden or lost because people were too entitled to realise that not everything on the internet is fair game.
But you know what? Personally I just don’t like seeing nice art being ruined so I’m unfollowing people who post that shit because I don’t want it on my dash. No one listens to little old me anyway so why should I need to justify anything else?