At codenames.game, it's all official, has support for every released wordbank+duos mode, and even lets you make custom wordbanks if that's your thing. I have no idea why they're so chill about it, I mean the game is just words so it would be impossible to actually stop people from playing it remotely if they wanted to, but it still surprises me that a company that publishes a physical game product is not only chill about people playing a free online version but is actually providing that version.
