I've seen lots of adoptables artists that are like "I won't do overtly complicated accents/skins" which rules out a LOT of them, lol.

I haven't seen skin/accent artists have issues with it, because usually the adoptable artist links to the accent in the list of what's been sponsored- and that's free advertisement!

If you think about it, you're not making the same profit off the accent, you're doing a tribute with free advertisement for the accent creator.