Blue sky has an owner and investors, right?
Publicly funded organizations should be required to use open solutions.
If they want to also replicate what they post somewhere open to BlueSky and Xitter, and Facebook, so be it.
That said, I could see carving out an exception for BlueSky if it provides the full open stack (public unauthenticated HTML, RSS, federation, etc ), and only while it does so.
Sure but an automated ban and manual review and removal could easily leave them blocked for more hours than not, each day.