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Not everyone agrees with every fact-check, even for objectively verifiable facts (which is the minority of all things claimed). Even Mythbusters have done things where I think they clearly reached the wrong conclusion. Having large consequences attached to the result of a fact check sounds like a recipe to alienate everyone.

If you say something obviously untrue there are already laws against fraud and false advertisement. For anything with less burden of proof, a note below your ad that adds context seems adequate

Seems like best of both worlds for scam ads with notes to still appear. The scammers keep paying the platform, user's learn how to spot scams via the notes, and the platform makes money.

I think it's a great idea, for obvious reasons it will never be implemented.