I feel like this has been done many times for content that takes a lot of effort to produce (e.g. podcasts and long-form content), but not for short-form low effort content. Which may be just the nature of the thing, participation is kind of the point for GM posts. But there's a dead zone between the two types of content, like when someone sends a really good tweet. But then that probably relies both on other people engaging to demonstrate signal, and algorithms to pick that stuff out. I like your reply though, I think it distills the problem well.