* Families with a shared computer in a common room. Super simple to setup, no fiddling, low price. In the video Apple showcased this use case. My parents have an M3 imac and it works great. They had their last iMac for ten years.
* Businesses buy these for reception areas and customers see the Apple logo on the back. Easy solution for a business with no IT department, great marketing for Apple.
Apple will probably always sell an iMac option as long as businesses buy and display them.