Earlier quoted context omitted.
Line, Viber, Telegram, Signal, Matrix etc etc.....there is so much competition in the messaging space.
WhatsApp is basically the norm outside of the US from what I can tell? So yeah, there's really no "competition". Either you have whatsapp or you don't talk to people. And it's highly used for cross-business communication in Europe, I can tell you that.
Which would mean that the lawsuit would fail. pretty much everything that happens outside of the USA is irrelevant for this lawsuit.