> certify and emphasize content that is grounded in science and verify content creators of such

Respectfully, how does this help? My impression is that the majority of the people who believe that e.g. vaccines are detrimental think that credentialing by traditional sources that don't agree with them (e.g. mainstream media) is simply evidence that the party has been compromised.

You'd be creating a subset of YouTube that is easier to ignore for the people who wish to.