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Well only real way the artist can "prevent" the spread is by A)not distributing it in first place, B)be a governement techy who can block and delete stuff on the 'net, C)a file suit where they have written proof and a warning on the image(original)

And most of time only way it can be crime and punish is by Option C which i listed above.

A site like Moe is what many people I know call a "Community-Based Anime/Series Imageboard" I call it that myself sometimes... But as you say probably isnt a "proper" term for Moe.