I've seen steganography in images, but putting secret data in text is a clever idea: https://medium.com/@umpox/be-careful-what-you-copy-invisibly-inserting-usernames-into-text-with-zero-width-characters-18b4e6f17b66
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Many of the GNU manuals are incredibly good. For example, the diff manual includes worked examples: https://www.gnu.org/software/diffutils/manual/html_node/Example-Context.html
What's the secret? My docs are getting better, but they're not on this level.
Smart devices that have continued despite the original company ceasing: https://www.engadget.com/2020-03-03-undead-gadgets.html
The secret seems to be a great developer ecosystem, a cute form factor, or a cult following.
The secret to uncontroversial pull requests often seems to be fixing a bug/adding a feature in as few characters as possible.