Hi
The bluetooth module is always on upon startup. I'm using my laptop more likely on battery, so it could be much better, to have it disabled all the time. I just don't use it anyway.
And yes, if I switch the BT off, this is relevant only before reboot.
P.S. sorry about my bad english 😅

If you can't disable Bluetooth by other means, then add to Startup Applications:

rfkill block bluetooth

To enable it again, run:

rfkill unblock bluetooth

    I'm running SOLUS Budgie.
    Turn BT off by activating bluetooth flight mode which stays that way even if I reboot in between.

      just it looks like a more hardcore solution) but I will read more about this command - thanks for your advice!