How does new content or content from new accounts get seen by anyone?
A feww options:
1. get some people who trust you to vouch for you when you join (similar to requiring an invite to join but maybe more flexible?)
2. some kind of induction process, maybe the algorithm surfaces your stuff and gets feedback, like the 'new' queue on HN
3. same as before but the AI tries to do it (scary though)
4. use the same account as on other sites, or otherwise tie it to a global reputation or something you had to invest a fair amount to build. Not great for privacy but I think it has to happen eventually; otherwise new accounts are too cheap to make.
Regardless, once you're in the system your credibility is only as good as your contributions, so you should be filtered out again if you're nefarious.
Same tree that gave them credentials gives them weight that is used to spread their content.
New User problem has been around for a minute though - wikipedia and stack overflow both faced it, as does every social media platform nowadays.
Reality is, though, new visitors are getting the same blast radius as early adopters got when they started, just that the early adopters now have blast radiuses that are much bigger
iykyk rules
People search for a thing, find said thing, then share it themselves under their own name. You know, like how conversations work in real life