Not true Teknochild.
A BOV has a stronger spring so the valve doesn't open under vacuum.
A diverter valve is design to run open to help bypass the turbo when its not spooled yet. Making the motor work less at low rpm to get air into the motor.
Once on boost the valve is closed untill the vacuum is released when you get of the throttle.
The diverted valve open under vacuum, and the small spring inside it help it stay closed under boost.
Just undo the return tube and see for your self.