We need to learn more about account security, who's on the hook if you get hacked or your phone stolen, etc. but assuming it has the same protections as a credit card (and not a debit card) -- I would consider using it.
I'm sure they have certain security measures in place for that not to happen, but as ivy said, needs more looking into to see what apple will have set in place
It seems like it has even more protection than credit cards. I like how findmyiphone can put a hold on any spending in case you lose your phone, or you see suspicious activity.