Claims are challenged all the time by other users and there are enough cases where fact checkers were wrong or heavily biased.

EU legislation tries to introduce "trusted flaggers". A ridiculous approach, an information authority by a state-like entity doesn't work, even if they paint these flaggers as independent. They simply are not, a trusted and verifiable fact.

Community notes provide higher quality info, it is the better approach. That is an opinion of course.

We will probably see community notes on trusted flaggers.