All of this makes sense, and it was with these considerations I decided to change the rules in OCA.

Based on what you're saying, it seems to me that a huge amount of the issues regarding fighting abuse can be resolved if...

An artist creates a work that is in large part or totally based on another work, they cite that original source.

In OCA, copies of drawings or paintings are currently against the rules at the "State level" and drawings or painting referenced from photos must cite the reference, unless the user is the owner of the photo, or the photo is a product bought by the user. This last exception is for an edge case where some people sell photo reference packs for artists, so it wouldn't be right to post their for profit product online for free.

There of course might be other edge cases or grey areas, but I think with that we can probably fix a huge amount of the issues.