Drama that deepens prejudice.
People insist it's low-quality. And if it's good, then it's robbing artists. And if you've never commissioned an artist in your life, then it's anti-environmental. And if running it locally barely warmed your video card, then it's theft. And if you'd otherwise borrow images from online... then shut up. Shut up is why it's bad.
I'd understand marking it, because some people still don't recognize it. But when they do they try to un-feel whatever reaction they just had. Oh that clever idea was illustrated by a robot? Then it means nothing, lacks intent, isn't art, fnord fnord etc. The minature version of tearing posters off your wall, insisting you never liked your favorite band.
Folks, the robot that draws anything isn't going anywhere. Make your peace. The software is aggressively available for local use, apparently simple enough that tech-bro douchebags can figure it out, and most damningly, was immediately adopted for pornography. It could at worst be chased underground... but it won't be. You will see people make things with this tech, when they otherwise couldn't, and at some point your distaste has to end.