> The reason you don't see long term support on Android is because of Qualcomm. Qualcomm wants manufacturers to build on new chips
Apple and Google make money off you for as long as you use your phone. Qualcomm only makes money when you buy it. Thus, Qualcomm has little incentive to maintain old chips for long. Not because they are evil, that would be another conversation, but because they only make money off newly sold phones.
Qualcomm actually started offering LTS (long-term support) BSP (board support packages) to device manufacturers for a fee. This is why some vendors like Samsung and Microsoft started providing updates for phones with older SoCs for longer than usual: they're paying the additional per-product license fee for being allowed to ship updated firmware.
Apple and Google make money off you for as long as you use your phone. Qualcomm only makes money when you buy it. Thus, Qualcomm has little incentive to maintain old chips for long. Not because they are evil, that would be another conversation, but because they only make money off newly sold phones.