Are you really calling letting a website be shown as “teaming up”? Breitbart isn’t even one of the 200 paid news websites and you're acting like they’re best buds with Zuckerberg. It’s this kind of foaming-at-the-mouth hyperbole that makes all of this so dangerous.
We're not talking about banning Breitbart, Facebook explicitly partnered with them in a new effort to promote "trustworthy" journalism: https://www.niemanlab.org/2019/10/facebook-launches-its-test...
In my original post I clearly stated this, so I'm not sure why you're confused.
They can simply not partner with them and they will retain their existing access to the service. Partnering is an endorsement and adjacent to moderation.
Worth pointing out that there are other conservative outlets on their list, ones with a good reputation (at least compared to Breitbart).