How? They arbitrarily blocked new versions of macOS from being installed on older macs (even if they are perfectly capable of running it after you install it with a workaround).

Compared to MS they basically don't care about backwards compatibility at all. For instance, good luck running most moderately old games (e.g. even from the 2010s) even on Intel macs after they stopped working because they were using any 32bit libraries. Or you can not update (even if Apple lets you) but good luck running any recent software then.