It’s easy to game systems unless you attach real stakes, like your reputation. You can vouch for anyone, but if you consistently back bad actors your reputation should suffer along with everything you endorsed.
The web badly under-uses reputation and cryptographic content signing. A simple web of trust, where people vouch for others and for content using their private keys, would create a durable public record of what you stand behind. We’ve had the tools for decades but so far people decline to use them properly. They don't see the urgency. AI slop creates the urgency and yet everybody is now wringing their hands on what to do. In my view the answer to that has been kind of obvious for a while: we need a reputation based web of trust.
In an era of AI slop and profit-driven bots, the anonymous web is just broken. Speech without reputational risk is essentially noise. If you have no reputation, the only way to build one is by getting others to stake theirs on you. That's actually nothing new. That's historically how you build reputation with family, friends, neighbors, colleagues, etc. If you misbehave, they turn their backs on you. Why should that work differently on the web?
GitHub actually shows how this might work but it's an incomplete solution. It has many of the necessary building blocks though. Public profiles, track records, signed commits, and real artifacts create credibility that is hard to fake except by generating high quality content over a long time. New accounts deserve caution, and old accounts with lots of low-quality (unvouched for) activity deserve skepticism. This is very tough to game.
Stackoverflow is a case study in what not to do here. It got so flooded by reputation hungry people without one that it got super annoying to use. But that might just be a bad implementation of what otherwise wasn't a bad idea.
Other places that could benefit from this are websites. New domains should have rock bottom reputation. And the link graphs of older websites should tell you all you need to know. Social networks can add the social bias: people you trust vouching for stuff. Mastodon would be perfect for this as an open federated network. Unfortunately they seem to be pushing back on the notion that content should be signed for reasons I never understood.