Yep, I did this. I had some art I’d made posted on my blog, and several somebodies liked it enough to make it the background of their MySpace page and use it as forum avatars/signatures. Pretty sure I saw a couple people using it in eBay listings too.

What made it bad is that they were using the full high resolution originals, not the thumbnails, which ate bandwidth like crazy.

So I did the referrer-based leech protection and started serving those users a tiny fake error dialog image, which was much more tame than what some people used. It’s funny how quickly those people stopped embedding, even without the image being anything shocking or objectionable.