I mean, it's really not at all that difficult to search for subs on Reddit and see how active they are, and then subscribe accordingly and join in on the convo. Who cares if
everyone goes to the exact same one? If people spread out to a few active subs, then the discussions will continue there. A few million here, a few million there.
Some of that hundred million would disappear, sure, but hey - what percentage of subscribers are relatively inactive anyway?