paul's blog article on smuggling arbitrary data through an emoji
"To be clear, this is an abuse of unicode and you shouldn’t do it. If your mind is wandering to practical use cases for this, shut it down. That said, I can think of a couple of nefarious ways this could be (ab)used:
1. Sneaking data past human content filters
...
2. Watermarking text"
https://paulbutler.org/2025/smuggling-arbitrary-data-through-an-emoji/
