I'm not sure Apple is the one to yell at here. The iPhone is one of the only phones that continues to get updates and is useful beyond 18-24 months. Short of destroying the motherboard, few iPhones are likely sent to landfills until they are many years old. They certainly do not end up in landfills because the lack of a user replaceable battery.

iPhone users either get the battery replaced, sell the phone, or they trade the phone in. The trade in then gets sold again, and likely again after that. The iPhones resale value makes sure it is a long time before any are simply thrown in the trash.

Apple will recycle any Apple product for free just by handing it to them in any of their stores. An Apple phone ending up in a landfill is the consumer's fault.

These recycled phones either end up as refurbished phones in other markets, or are taken apart by their special robots down to the individual pieces, which are then recycled themselves.

Apple will pay you to not throw your old iPhone in the trash.