My question is, what aspect of the law did they break? I'd like to know the details. The articles in English have few real details about what happened.
You're not looking for details, you're asking for details. Did you try Google Italy or Google Translate to translate Italian articles into English?
i guess you must have taxi license to transport people in car, in my country taxi cars must have also Surfside insurance, Uber cars have none of these so they have unfair advantage which is funny considering they are in peak hour more expensive than taxi with flat rate prices (only difference is day vs night)