^
No, that's wrong.
At the time there was an influx of super shitty ms paint drawings, and it got old fast. So they added that rule against shitty drawings that people spend 30 seconds on and post for the hell of it.
It should really be reworded to make it clear that it's against shit that takes no effort and is essentially spam.
There have been some really good works from mspaint posted before, and it is fine so long as they aren't the aforementioned no-effort-shit.