Same as Apple's reasoning for their other, er, opportunistic hesitance when it comes to interoperability: "Every time we add friction to the boundary of our ec

Same as Apple's reasoning for their other, er, opportunistic hesitance when it comes to interoperability: "Every time we add friction to the boundary of our ecosystem, it drives people to operate exclusively within our ecosystem". There's a reason people without iPhones show up a different color in iMessage too (and that group chats with Android users frequently don't function [carrier dependent]), and it has nothing to do with technical constraints.