Given how it has deeply suffered and continues to suffer for misinformation and spam, Facebook has implemented more stringent measures to make sure its platform remains in the good graces of users and of governments.
https://www.slashgear.com/facebook-blocked-legit-covid-19-posts-by-mistake-18613519/
https://www.slashgear.com/facebook-blocked-legit-covid-19-posts-by-mistake-18613519/