Because Bluetooth is a separate hardware module than the CPU. “Sleep” is just a low-power state for the CPU, one of the “S” states. Other modules on the motherboard are still powered and can handle their own tasks, like Wake on LAN received at your network card, or keeping your RAM hot with your running programs.
I dislike apple as a company but I have about 19 years of experience very much to the opposite of this claim.
Why bluetooth on M1 Mac stays on while machine sleeps?
Because Bluetooth is a separate hardware module than the CPU. “Sleep” is just a low-power state for the CPU, one of the “S” states. Other modules on the motherboard are still powered and can handle their own tasks, like Wake on LAN received at your network card, or keeping your RAM hot with your running programs.
I’m not familiar with that (completely different) topic