Thousands of people are being detained and questioned for sending messages that cause “annoyance”, “inconvenience” or “anxiety” to others via the internet, telephone or mail.
https://www.thetimes.com/uk/crime/article/police-make-30-arr...
https://www.thetimes.com/uk/crime/article/police-make-30-arr...
Regarding the abortion clinic case, those aren't content restrictions. Even time/place/manner restrictions that apply to speech are routinely upheld in the U.S.