That's what I'd expect, copyright on the word list. However, IANAL and I would love to see some proper analysis on the legal status of clones, especially identical ones with the same word list.
You can have a perfect clone of wordle running in a couple of minutes, but I'm certain that would be copyright infringement.
You can have a perfect clone of wordle running in a couple of minutes, but I'm certain that would be copyright infringement.