Sure it does, but cross platform IMs are not so socially discriminating. You can easily download LINE and move on with your life in Japan. But getting iMessage is an economic barrier for many, for which they end up being socially ostraostracized
Are you really going to buy, charge, supply with data and carry around a second phone, no matter how cheap, just so you can send blue messages? That attitude is, like many american ideas, really whack.