That is hilarious nonsense. Nothing could be further from the truth!Doesn't matter what the document is; you going for force software manufacturers to design to the lowest common denominator. The regulations are socialistic in nature and I think over time this is going to have a chilling effect in the EU. YMMV.
iMessage and other services can continue unchanged. The only change is that Apple and other service providers have to provide gateways to other corresponding services if other service providers ask for it, so users can choose whether to actually communicate through those gateways – or not!
It's all about users gaining choices which are currently still blocked by service providers.