Why not? "commercial reasons" for not supporting a device with updates is planned obsolescence. You (as a device manufacturer) plan to release a new model, so y

Why not? "commercial reasons" for not supporting a device with updates is planned obsolescence. You (as a device manufacturer) plan to release a new model, so you try to make the old one obsolete. Now given, the device might not stop working immediateley, or maybe never. The issue is that without updates your device might join a botnet. There are ways around it. After you supported your device for the mini time that is 2 years (even if). Release ALL your sourcecode for that device.