I don't think that is scalable to infinite iphones since the input materials are finite. If your all your friends get 100,000 iphones and then you need an ev battery and that now costs 20,000 iphones now and you're down 5k iphones if the previous battery cost was 5k iphones. On the other hand if you already had a good battery, then you're up 20k iphones or so in equity. Also, since everyone has so many iphones the net utility drops and they become worth less than the materials so everyone would have to scrap their iphones to liquidate at the cost of the recycled metals.