Earlier quoted context omitted.
Does there exist any company that allows their employees to work any number of hours they want, whenever they want?
What does that matter? Just because you can pick your own hours/work schedule, that doesn’t make you an independent contractor. At least it’s not determinative in the US under federal law nor any state that I am aware, but maybe that is the Dutch law and the court just got it wrong here
To determine if they are contractors we look for ways the user/driver relationship is different from other businesses using the employee model.
If no other businesses allow employees to set their number of hours with such flexibility then that is evidence the relationship doesn't fall under the employee model.
This need not be all or nothing but it is (obviously) a factor.