This would probably still be way better than the status quo, because it would introduce a higher barrier for entry and more friction into the slop delivery system and give the moderation and spam detection a chance to catch up. Much easier to detect and delete 5000 laundered slop images than 500.000.
I think it would be hard to make that look like an image you'd taken naturally, rather than one of a screen
That might impose enough effort to stop most slop from being spammed everywhere.
Could offer a service that automates it with a DSLR pointing at a screen laundering images one after another.
This would probably still be way better than the status quo, because it would introduce a higher barrier for entry and more friction into the slop delivery system and give the moderation and spam detection a chance to catch up. Much easier to detect and delete 5000 laundered slop images than 500.000.