They can moderate by boosting certain opinions and downranking others. It doesn’t need fact checkers because it’s platform owner interests and not facts that matter.
That just means they'll favor the right wing content since it currently benefits them. They will continue to moderate and shadow hide whatever they don't agree with or are paid to censor.
It's valuable, it's not as valuable as the entire rest of the world combined. The US simply doesn't have the user share to demand the service be sold off.