It's not "trimmed" at all. When hydraulic actuators are not powered, rudder is free to move with the wind. On picture you've posted wind is coming from the right side. As soon as pressure gets to actuator, rudder moves to its commanded and trimmed position and it's fairly close to neutral 99% of the time.
Why some a/c and not others? Depends on trapped hydro pressure when pumps are off, rudder geometry and wind direction/velocity.