FWIW this appears to be coming from a company called Bandwidth (?)… I know nothing about them, but it seems like it might be directly exclusively (for now) at mass messaging services. Still way too much subjectivity possible for service that is broadly used by the public.

https://news.ycombinator.com/item?id=38761131#:~:text=SHAFT%20is%20a%20handy%20acronym,depictions%20or%20endorsements%20of%20violence