Earlier quoted context omitted.
'Nobody' in the EU uses iMessage, even on iPhones. Everyone here already uses Whatsapp. This demonstrates a lack of a monopoly and how competition can flourish. Honestly - and EU-regulation that Apple faces over iMessage would just be collateral damage from EU targeting Whatsapp.
I mean, if everyone is using Whatsapp, that is effectively a monopoly. I am curious as to what the runner ups are in the EU however. Meanwhile, wait until Mr. Zuckerberg looks for new ideas to monetize their messaging ecosystem.
WhatsApp is the current leader because it's no-nonsense and works everywhere. The moment Facebook fucks that up even a little bit, people will have moved on to the next thing.