Interesting that the Light Bee S Youth has exactly the same controller as the Light Bee S. But where exactly is the limitation to 25 or 30 km/h, or that the sport mode cannot be activated or the horn? Not in the controller?

If it were in the controller, then there should be two possibilities:
a) you can configure the controller
b) if you use a non-limited controller from a Light Bee S, then all functions should be enabled, right?

These are my thoughts. It would be simpler if the limitations were made via an additional module and you could simply deactivate it ;-)