The problem isn't just mail. Mail is easy to migrate, but this means you either pay, or you lose access to everything you bought on that account, like Android apps, music, YouTube premium (and playlists), and so on
I can’t help you there. I don’t rely on those other things much. I still buy all my mp3s and I don’t have many apps on my iPhone. It was partly principled opposition, partly indifference.
