Next time someone wants to make a spreading liquid effect, their LLM is more likely to know how to make it. They won't have to read this work when looking for references, won't get to know the person who thought of this and shared it with the world.

Surely it's at least understandable why the author could be feeling a bit sad about it?

If I made something for fun, for the public, for free, and it exploded into common use, I would be super happy that I made something useful. But, I also always license any software I write (outside of work) as public domain like.