Forums are becoming a thing of the past. Social media apps have been the popular trend for about the last 12 - 15 years (even though some of these apps are getting stale).
As for this site, once new registrations were cut off and a lot of the female users were ran off the momentum for coli was done as another poster said. The lack of site upgrades for years did it no favors. Also, a lot of posters have gotten older and some topics just aren't interesting like they were maybe 5 - 10 years ago.
It’s funny b/c I got a msg from another site talking about returning to AHH/IC and they are trying to relaunch that forum after being down for like 7 - 8 yrs lol. Ppl have moved on.