Seriously, stop thinking about this in terms of: I can format my cards however I want, don't abuse the money I already pledged for other patents, knowing this pains me.
More like something that gives you a clear advantage: hey Marc, I would really love to dl the pictures from your uber-camera 256mpix and all that you carried with you on our vacation, but, could you possibly reformat the card before you pass it to me? My beliefs prevent me from exfat, nothing personal dude
Nah, lets make it a moral issue