Things perhaps feel different, though I doubt much has changed.
Discord has probably made it easier in recent years to just stick to your private discord circlejerks. Not much point spending time talking in public forums all day when you can just shitpost with your close friends/teammates
In general friend groups often just kinda stop being interactive for no real reason after a couple years so maybe you're just experiencing that right now. Or maybe TFTV just feels different because a lot of the disturbingly active shitposters from back in the day quit while you have little interest in whoever took over that role