This could be solved on basically all arti communities by simply putting in a post limit per day. Say an artist can only upload 5 images per day or something, why would someone need to upload more than that?
But when communities are flooded with cheap-to-make art - even if the art is pretty good - the community becomes a worse place to be.
This is like when we discovered stereo recording, and mixers would put tracks at either 100% left or 100% right, just to show off the novelty of it.
Or when 3D movies became ubiquitous and every movie (even those shot completely without the third dimension as a consideration) got released in 3D.
Once the novelty wears off, I imagine things will be better.
For now, it’s just a deluge of low-effort, yet high (relative to traditionally produced art) apparent quality artworks.
There's been more than a few days when I've uploaded more than 5 images a day to flickr/Instagram (according to my backup, I uploaded 27 images to Instagram on 2007-02-04 during a day-long walk.)