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.
Bolt has a tiny bit of market share, Lyft is all but existent. Uber has a de facto monopoly in The Netherlands.