What if somebody posts a dangerous lie on a centralized platform and blocks everybody who criticizes it? Even if it doesn't allow deleting comments, you can eff

What if somebody posts a dangerous lie on a centralized platform and blocks everybody who criticizes it? Even if it doesn't allow deleting comments, you can effectively the same result with just block. A mute-only social media platform would be doable technically but it would likely involve tons of spammers replying to large accounts. Think about how unusable the replies to an American politician's tweets are on Twitter because the US courts have ruled that it is unconstitutional for politicians to block people on social media. The best solution to this problem I've seen so far is Community Notes on Twitter where a crowdsourced fact check is directly pinned to the tweet allowing users to challenge liars without directly calling them out and getting blocked. More centralized approaches to fact checking don't work particularly well because you end up with biased fact checkers who clearly have an agenda and thus aren't trusted at all by the liar's audience.