This has been discussed and experimented with to death where such networks existed for a long time. Just because you never heard of them or even knew they exist doesn’t mean that they don’t.
See Freenet/Hyphanet and the three approaches (local trust, shared user trust lists, web of trust) if you want to learn something. The second one worked out the best from a performance and scalability point of view compared to the third.
This has been discussed and experimented with to death where such networks existed for a long time. Just because you never heard of them or even knew they exist doesn’t mean that they don’t.
See Freenet/Hyphanet and the three approaches (local trust, shared user trust lists, web of trust) if you want to learn something. The second one worked out the best from a performance and scalability point of view compared to the third.