More members create more conversation.
They also create more work.
Every growing community eventually produces edge cases: spam, personal attacks, duplicate questions, appeals, off-topic arguments, scams, moderation disputes, rule-lawyering, and users who discover exactly how close they can stand to the line without technically crossing it.
On volunteer-run platforms, somebody has to handle all of that.
Research using private moderation logs from 126 subreddits and more than 900 moderators found that the visible actions outsiders can observe substantially underestimate the total human work moderators perform behind the scenes. See All That’s Happening behind the Scenes.
That invisible workload changes the economics of community growth.
Growth does not scale the volunteers automatically
A community can double in membership without doubling its moderation team.
The additional users may create more posts, reports, appeals, conflicts, and edge cases while the same handful of volunteers still has the same number of evenings available.
One 2023 Reddit study focused specifically on ban appeals and found moderators spent substantial effort investigating them. A redesigned appeal process that added friction reduced the number moderators had to examine while preserving roughly the same number of successful appeals. See AppealMod.
The important point is not that friction is always good.
It is that volunteer attention is finite.
A smaller group can be a survival strategy
Communities can respond in several ways.
They can close new registrations temporarily. Require invitations. Add posting requirements. Limit promotion. Make some channels read-only. Create stricter rules. Refuse certain kinds of content. Or deliberately remain small enough that the existing moderators can still recognize what is happening.
From the outside, those decisions can look anti-growth.
They may actually be pro-survival.
An open community that expands beyond its ability to moderate can become so unpleasant that the people who made it valuable leave first.
Reduced reach can preserve participation
This matters for Dead Internet Theory because smaller or closed communities may be interpreted as evidence that online social life is shrinking.
Sometimes the opposite is true.
The people running the group may be limiting growth specifically so the existing conversation can continue without exhausting the volunteers maintaining it.
A healthy community does not necessarily want the maximum number of humans it can technically fit through the door.
Sometimes the fire code is social.