It’s a neatly polished programming challenge site which is both communal and competitive, there’s a bonus score (I think) for completing on the same day a challenge is released, there’s a leaderboard race for the first 100 answers each day (typically all gone within 1-2 minutes after midnight) and there’s a subreddit where people share their solutions in all kinds of languages, and it’s nothing to do with competing for a FAANG job interview.

But apart from that it is “just” coding challenges with a story wrapped around them, and if you don’t like those, you won’t care for it.