If you enlarge your AI images substantially...

If you enlarge your AI images substantially, it's a good idea to check the image boarders. I don't think this would be cause for rejecting an image, but one never knows how picky a particular moderator might be.

In the example attached, note the light border that is created after upscaling a 1456x816 (72 dpi) AI image to 30" wide @ 300 dpi, which can easily be corrected with Content Aware Fill or a very slight crop. Then, after you've corrected that, look for more major issues one last time. 🙂