Here's an article about the IP around Wordle [1]. In short, people cannot rip-off the 'look-and-feel' of Wordle, but they may work around it. The idea behind Wordle itself is, as the article points out, not original.

Hopefully it works out for the creator. Maybe helping to spread the word that 'app X is not the original Wordle' might help to give him more visibility among people playing the game.

[1] https://arstechnica.com/gaming/2022/01/wordle-and-ip-law-wha...