What is bluetoothd? Why isn't it running?

Why do I need to run %bluetoothd to get my Bluetooth mouse to be detected?

If I don't do this the bluetooth connection in the taskbar just flashes blue when I move the mouse.

What I don't understand is why my Bluetooth speaker works but my mouse doesn't until I run this command?

Finally, how can I make this fix permanent?

edit: This trick has stopped working now. I can't use my Bluetooth mouse. It's back to flashing blue in the bluetooth taskbar.

% bluetoothd       
objc[2167]: Class PipeInfo is implemented in both /System/Library/PrivateFrameworks/WPDaemon.framework/Versions/A/WPDaemon and /usr/sbin/bluetoothd. One of the two will be used. Which one is undefined.
[bluetoothd][netPrefChanged] ###### Sharing Dictionary doesn't exist
2021-02-25 09:30:53.287 bluetoothd[2167:19352] Error: [AppleBluetoothHIDDeviceGen2][_setEventService:]Couldn't copy BD_ADDR
2021-02-25 09:30:53.287 bluetoothd[2167:19352] Error: [AppleBluetoothHIDDeviceGen2][_setEventService:]Couldn't copy BD_ADDR
2021-02-25 09:30:53.292 bluetoothd[2167:19352] [setSystemPreference] syncs returns false
2021-02-25 09:30:53.294 bluetoothd[2167:19352] [setSystemPreference] syncs returns false
2021-02-25 09:30:53.460 bluetoothd[2167:19352] [setSystemPreference] syncs returns false
2021-02-25 09:30:53.462 bluetoothd[2167:19352] SystemPowerNotifier: IORegisterForSystemPower for port 38147
2021-02-25 09:30:53.487 bluetoothd[2167:19352] [setSystemPreference] syncs returns false
2021-02-25 09:30:53.488 bluetoothd[2167:19352] [setSystemPreference] syncs returns false
2021-02-25 09:30:53.501 bluetoothd[2167:19352] [setSystemPreference] syncs returns false
2021-02-25 09:30:53.502 bluetoothd[2167:19352] [setSystemPreference] syncs returns false
2021-02-25 09:30:53.503 bluetoothd[2167:19352] [setSystemPreference] syncs returns false
2021-02-25 09:30:53.505 bluetoothd[2167:19352] [setSystemPreference] syncs returns false
2021-02-25 09:30:53.507 bluetoothd[2167:19352] [setSystemPreference] syncs returns false
2021-02-25 09:30:55.595 bluetoothd[2167:19352] [setSystemPreference] syncs returns false
2021-02-25 09:30:55.814 bluetoothd[2167:19352] newlyConnectedHIDDevice
2021-02-25 09:30:55.829 bluetoothd[2167:19352] [setSystemPreference] syncs returns false
2021-02-25 09:30:55.833 bluetoothd[2167:19352] [setSystemPreference] syncs returns false
2021-02-25 09:30:55.846 bluetoothd[2167:19352] [setSystemPreference] syncs returns false
2021-02-25 09:30:55.849 bluetoothd[2167:19352] [setSystemPreference] syncs returns false