How does this work with end to end encryption? Just out of curiosity
Sorry to be "that guy", because I don't know the details of how WhatsApp does E2EE, but in any proper (as in secure and private) implementation the only thing that should matter is whether the client follows the spec? You might as well ask, how does $browser work with HTTPS?
The "spec" is not relevant in any way because we have no idea what else is going on. Why was it relevant that these operators must specifically be in the EU? Everyone is just complying with the global spec...but the app provider must be in Europe...okay.