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I think the reason it’s not used anymore is because it was used maliciously to share CSAM on other boards and 4chan banned uploading anything that looks like a concatenated zip

:/

That first read should be an HN post in its own right.

https://news.ycombinator.com/item?id=18342042

FYI, the blog post describes a zip file embedded in the ICC profile data of a JPEG in order to survive web image transformations, whereas the linked Tucker script is just appending the zip to the image.