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pocorgtfo
a "Proof of Concept or GTFO" mirror with an extensive index with also whole issues or individual articles as clean PDFs.
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1) People systematically underestimate how easy it is to create collisions that still do something "interesting", like being polyglots. See PoC||GTFO, specifically anything by Ange Albertini, for examples; grep https://github.com/angea/pocorgtfo/blob/master/README.md for "MD5".
1bis) You can use an existing collision to create new collisions. People seem to think you need to generate all the work again from scratch.
1cis) The files do not need to be gigantic.
2) You can do the collision in advance, and publish the malicious version later. What it accomplishes is that the concept of "this Git hash unambiguously specifies a revision" no longer works, and one of them can be malicious.
3) The standard should be "obviously safe beyond a reasonable doubt", not "not obviously unsafe to a non-expert". By the latter standard, pretty much any random encryption construction is fine.