[cubefox]

iOS did boycott RCS for a long time in order to convince US teens to buy iPhones rather than Android phones (due to incompatibilities between iMessage and SMS, which are popular in the US). It worked. I think there was even some leaked internal email which admitted to doing this. The US antitrust agencies ignored it; there were no legal consequences for Apple. I believe Apple finally decided to add RCS support after EU legislators threatened to force their hand.