To expand a bit on the user base issue: Even on Reddit with its giant user base a game needs to have a decently sized audience in order to sustain a healthy and active subreddit.
Now, hypothetically speaking, even if this place had a tenth of the user base, it would mean that a game would still need to be 10x bigger in comparison in order to maintain an active community.
For now, only a very, very small handful of games are above that threshold.