Earlier quoted context omitted.
microcommunities and web of trust. the things you mentioned are not eliminable but i trust my peers more than a multinational with conflicting values.
You are literally describing the breeding grounds of radicalizing young men on the internet. Microcommunities, if anything, have proven themselves incredibly dangerous to human life.
The size of the community is probably less relevant that how it is grown. Self-selection (like e.g. hackernews) is certainly much more vulnerable to groupthink.