Yes, Harry Potter: Wizards Unite is still a thing. The game is still running, and it’s even updating. The latest major update is being rolled out now, and it brings with it a change to the way that Chamber lobbies work. Players can now drop in directly to the challenge if playing solo, or at least notify fellow players in the lobby about being ready to start the challenge. Useful tips for coordinating in difficult content, definitely.
The patch is also offering players the option to download minimal assets to phone storage, useful if you don’t have a lot of memory on your mobile device. There are also bug fixes and new ways of sorting collected objects, just to improve the overall experience. Check out the full rundown with the official patch notes if you’ve still got the game installed on your phone, or if you’re just curious about how the game is moving forward.