It looks like there are a few sites still "alive" thanks to Stack Exchange denizens solidarity that keeps the site live by:
- editing posts to fix spelling, grammar, formatting and other writing problems,
- fighting spam and about across the network.
- upvoting / downvoting
The association bonus facilitates this, as users having rep 200 in any site can edit, flag and comment on almost any post on Stack Overflow and Stack Exchange sites.
Unfortunately, sites like Community Building are still in beta after 10 years than the site proposal was created. According to https://stackexchange.com/sites, it has 2 visits and less than 1 question by day.
An old meta post from 2019 asked if the site was dead, Is this group dead?. I had only one answer posted at that time: there was not much activity because there were no new questions. This year, 6 questions and 6 answers were created. Only one new question got answers; I got 1 answer.
A few days ago, I posted three questions on the main site and one on Meta. I deleted one. So far, no answers; only one question got comments from one user that followed me from a post in Super User.
While the Stack Exchange denizens keep helping the site be free of spam and abuse, this site will keep alive, and new posts will still have a chance to get an answer someday.