Surprise, people have been banned over incendiary comments threatening the lives of police.
You need to take a civics class.
Saying "F*CK THE POLICE." is expressing a personal disposition of an establishment or aspect of government.
Repeating lies about the government which have not yet been proven in a court of _law_ , targeting people and calling them traitors, evil, liars, etc., is sowing social unrest and discourse that the companies hosting his rhetoric do not want to be party of, or potentially held liable.