alt Hacker NewsMaybe for high-stakes things, serious journalism or closer interactions, but most of the time in the Internet we just consume content by unknown people and we don't stop to check their trustworthiness. In the OP's context (game wikis) you're probably not going to know the people signing the wiki's content.
You probably know somebody who knows somebody who knows them, we're just not presently engineering for that fact to matter.
The most famous attempt at a web of trust was PGP, but it just attempted to bind a public key to a name. That's too generic. Only privacy nerds are actually going to have a key signing party if that's all they get out of it.
I think that it'll go better if the we're attesting about common interests. Like, go to the event because you're enthusiastic about games, end up with some public keys as a side effect.
It'll be hard if you're the only person you know with a particular interest and it's impractical to travel to wherever people with that interest gather. Then you'll have to take a gamble on some internet handle you've never met. But really that's just falling back to the dubiously trustworthy web we currently have.