It is actually said (though may be urban legend) that the sticking two fingers up ina fuck you gesture originated from fact french would cut english archers fingers off if captured ( as English archers were such a boon to the army) so Brits would line up and taunt french that they all still had fingers to pull the bow.
That may be what is depicted here, flicking the V
Depends if you trust your password manager site more than either site you put the same pw into