But there was a lot of controversy around the scrabble word list - I don't recall how that turned out in the end:
https://slate.com/human-interest/2014/09/scrabble-copyright-...
Some mapping companies "invent" non-existing streets on their maps to prove copying.
The design and feel of the site is probably unarguably copyrighted though. While other clones could argue that Wordle is actually a derivation from a much older game, it won't probably help if the design, feel, "dress" and colours are one-to-one to the original thing.
Here's a link to the Wikipedia editors' terse description on curated lists:
https://en.wikipedia.org/wiki/Wikipedia:Copyright_in_lists#S...
A fact you may not know is that the creator and his partner curated the two lists of words-accepted-as-guesses and words-eligible-to-be-daily-targets to remove so-called "Scrabble gibberish."
(and words, well, of course. Books are words, right?)
There were some lawsuits about Tetris. You can make a game with the rules like Tetris. But you cannot name it Tetris, and you cannot make it look too much like Tetris.
The HTML, CSS and JavaScript layout out the page is also copyrightable, and the taken-down site is a direct copy of this
I think the only likely thing that might be illegal is using the same name. Game concepts are copied all the time, from what I understand. I'm not a lawyer.
Kudos to the guy that wrote it and sold it. I don't see how NYT can monetize it - if they put up a paywall usage goes to 0 real quick.
Have you literally never heard of text being copyright?
Second guess: crosswords have sufficient creative work involved. A list of random English words with 5 characters?