Gatekeepers. Administrators control what is taught. He's proposing a site like HN, where users submit links.[1] The flip side, of openess, is that a Wiki site would need Editors. Or some similar ranking algorithm (and a defense against spam/seo etc.)

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[1] The destination/backend of where those links are stored/maintained etc is presumably also part of the platform. As would be some consideration about intellectual property, ect. To the user, though, the more relevant bits are in the above sentence.