Also even if you don’t buy a new iPhone now, i.e. you keep using your old iPhone, they still benefit if you continue to buy apps (and buy in-app purchases), if

Also even if you don’t buy a new iPhone now, i.e. you keep using your old iPhone, they still benefit if you continue to buy apps (and buy in-app purchases), if you continue to buy from iTunes just for the convenience, or subscribe to Apple Music. This incentivises them to support all their phones as long as technologically possible. Other phone manufacturers have the opposite incentive, they want you to buy a new phone ASAP, since they earn nothing if you don’t buy a new phone. From an e-waste perspective, Apple’s model is definitely better.