Specific passenger insurance the first thing. You don't have that in Uber. Another special regulation is that taxis pay to the city council to operate. Uber drivers don't do that.

If you are digital services company then the only regulation you need to follow as those of your home jurisdiction. All relevant EU law is included in those regulations.

Transport services are specific exception to the single market where local jurisdiction can have different regulations and you need to follow the regulations in any jurisdiction your customers are present in.

Fares are regulated and in many cases the start, per kilometre, and waiting charges are listed on a label inside the taxi.