They got excited, they expected other people to generate the content, and they got bored and left.
Starting a community takes real work, you got to do the legwork to get people aware, you’ve got a generate content to start the conversation, you’ve got to keep the ball rolling to keep people invested, it’s a non-trivial work.
Founding a community then posting a request for moderators and walking away isn’t going to cut it. It’s a big time investment. So I salute the people who are doing it!