Oh wow, e621 flat out allows nazi art1, and will take punitive action against people who report it. I mean, we thought they were shit anyway, 'cause of all the art theft, and transphobia and interphobia, but this is a new-to-us low.
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Moderator explains their policy in the comments on the following (CW: nazi art): e621.net/posts/4267607. (Intentionally not a link, 'cause fuck giving these nazis an SEO boost.)