Hi, thanks for reaching out! Please allow me to assist you.
Bluetooth User Support Service is a per-user service. Per-user services are services that are created when a user signs into Windows or Windows Server and are stopped and deleted when that user signs out.
They are based on a template service. You can set the template service's Startup Type to Disabled to create per-user services in a stopped and disabled state.
To do so, you can change the startup type for BluetoothUserService under HKLM\System\CurrentControlSet\Services. https://docs.microsoft.com/windows/application-...
Here a command line to perform the same as well.
REG.EXE ADD HKLM\System\CurrentControlSet\Services\BluetoothUserService /v Start /t REG_DWORD /d 4 /f
Once you have made the change, restart and observe if the service is disabled.
Please let me know if I can help you further!