Is Uber the only rideshare company available in Europe? In America, every rideshare car has uber and lyft stickers, at a minimum. Just about every driver keeps both apps open and takes rides from wherever they come in.
I think GP has a good point, I took a slightly america-centric POV on the issue; topic is specifically about Dutch legal system. Nonetheless the end bit about 'strategies' is likely to be applicable across jurisdictions.
Here in the UK Uber drivers have Uber stickers on their cars. I rarely get picked up by a driver without them.
What imaginary other company are they working for that would tolerate that?
It might not be the case in America, but over here it certainly seems most drivers are working for one company.