Just bumping this one in case anyone ever wondered how to do this.  I was just trying to search for something.  I'd stickied this here a long time ago, but not sure if anyone else knows it's here.
Looking at that member list.  Some real blast in the past names there.
Sorting by registered date, nobody new has joined in over a year.  It looks like it's been 3 years since a new active poster has joined.
Year registered for users with over 100 posts, 
2006   144
2007   477
2008   99
2009   89
2010   91
2011   81
2012   64
2013   74
2014   73
2015   54
2016   25
2017   21
2018   10
2019   15
2020   11
2021   3
2022   0
2023   0
2024   0
I kinda thought this might happen with the move to and then split from SB Nation/Celticsblog (which happened in Sep '18). but the site still was able to draw some new users for the next couple of years.  Kinda surprising no spike with the Isaiah teams or wining the lottery/signing Hayward/getting Kyrie.  I would think some of that would spike new users similar to what I believe the KG trade did in '07.  Even the '22 Finals run (well after the Celticsblog split) no new active users joined.
So maybe this is just old tech?  I believe many of us are younger Gen X and older Millennials.  Maybe younger Millennials and Gen Z moved on to other avenues (Twitter, Reddit, Facebook, Discord, etc.) to discuss their fandom?  Or maybe nobody can find us?
Maybe we should re-brand?  Taylor Swift Strong!