I'm taking a guess, and I suspect you have experienced 'inactive' forums here or elsewhere or maybe both.
An example, perhaps, Steel Panthers.
The forum HERE for Steel Panthers might seem kinda 'dead'. Is the game dead? Not even close. You just need to know where to look.
The Depot makes it clear, the love of the game is not dead. But it was made originally in the 90s. And some of the people who made it actually are passed away. Matrix Games gave us 4 Mega Campaigns for Steel Panthers. But that game had its heyday in 2003. I STILL PLAY IT. But there isn't much left to chatter about it.
SSG, some great games, but they have suffered from people passing.
2by3, hey they can only do one thing at a time. I hope I don't pass before 2025. I want to play Steel Tigers.
I don't get a chance to play WitE much. I'll probably buy WitE2, and then it will be like my purchase of TOAW3, didn't get around to it much, and now I have TOAW4
The forums for Battle Academy are probably quiet, I don't know. Everything has it's day, and then that day ends. It's still one of my favourite squad tactical.
You can't base the value of a game on a forum. And these are not MMOs
Wargame, 05% of the time.
Play with Barbies 05% of the time.
Play with Legos 10% of the time.
Build models 20% of the time
Shopping 60% of the time.
Exlains why I buy em more than I play em.