I wish that people wouldn't use art/fanart without sourcing the artist. I really hate the reposting and art thievery bullshit too. It's not fair to the person who worked so hard on the art, whether it's traditional or digital, that their art is used for things like videos or icons without credit. Hell, they don't even get asked permission most of the time.
I don't care if you put "Art not mine" or whatever in the description. That's not proper crediting and it's not okay. If you can't source the artist, then don't fucking use their art. Especially if you haven't even asked the artist first!
Personally, I don't think that I have experienced