"Parents React," "Celebrities React," and "Parents React";
In the USA, film rating is voluntary
Yes, but the FCC is not, both the BBFC and FCC impose obscenity rules on broadcasters, both can levy large fines for non-compliance. Censorship exists in every nation, if you doubt that then try broadcasting kiddy porn from anywhere on earth. There are limits to freedom of speech around the world (even in the US), some are for common-sense, some for common decency, and far too many for political gain.
If it happens once, it's a bug. If it happens twice, it's a feature. If it happens more than twice, it's a design philosophy.