The FTC has a page on this (https://www.ftc.gov/advice-guidance/competition-guidance/guide-antitrust-laws/dealings-competitors/group-boycotts https://www.ftc.go

The FTC has a page on this (https://www.ftc.gov/advice-guidance/competition-guidance/guide-antitrust-laws/dealings-competitors/group-boycotts https://www.ftc.gov/advice-guidance/competition-guidance/gui...). Companies have a right to independently boycott whoever they’d like, but coordinated boycotts raise antitrust concerns, and Twitter argues that this boycott was strongly coordinated through the Global Alliance for Responsible Media. (The defendants deny this IIRC.)