I do wonder though how "stable" embedding files is.

I was surprised to see this was still working 3 years later:

  $ curl -s https://pbs.twimg.com/media/Dq2sPGNU0AEKyyC.jpg | dd status=none bs=1 skip=599 count=40| sh

From https://news.ycombinator.com/item?id=18347985