I don't know the details but it could because in many countries there are different licenses for taxis that can pick up off the street, as opposed to licensed car services that can only be pre-booked.

Uber tends to operate as the latter, using the laws for a pre-booked taxi service.

This law is obviously protection for the classic taxis by giving a legal standard to what it means to be pre-booked. They can claim to be just clarifying an existing law.