alt Hacker NewsThe subtext here is that there's a difference between someone saying "I don't like this community, I'm going to make my own" and "I don't like this community, I'm going to change it".
Building communities is hard. It's not obvious why someone who wants a community on their terms gets to piggyback on an existing community rather than putting the effort in to make their own.
The point of "just fork it" is that if your ideas are popular, then sustainability shouldn't be a problem.
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The problem with that premise is that often, projects can be having trouble with sustainability already, so even if you're getting 90% of the people in your fork, that might still be too few.
If 90% of the contributions are by 10 people, if the project is large enough, losing one of them is going to be an enormous additional tax on people unless you can get an additional one to step up.
Every community is the sum of its members. Each person who joins changes it, at least a bit. And each of those members is changing and growing.
When community members have different needs, forking should be a last resort. It's expensive, and it's wasteful unless two different groups have irreconcilable needs. It should only ever be suggested as a last resort, after other options have been exhausted.
However, it's often used as a first resort to shut down criticism and to protect existing power structures. The person who speaks up is, as here, treated as an outsider and an exploiter.