I think "internet" needs a shared reputation & identity layer - i.e. if somebody offers a comment/review/contribution/etc, it should be easy to check - what else are their contributing, who can vouch for them, etc.

Most of innovation came from web startups who are just not interest in "shared" anything: they want to be a monopoly, "own" users, etc. So this area has been neglected, and then people got used to status quo.

PGP / GPG used to have web-of-trust but that sort of just died.

People either need to resurrect WoT updated for modern era, or just accept the fact that everything is spammed into smithereens. Blaming AI and social media does not help.