I was trying to be sophisticated, but I meant to ask: why not just use uber to do business, instead of protesting it?

I'm not a taxi and I don't know everything about it, but if you had to choose between a job where you have a long term contract with a company, that pays well enough, and offers protection, and a job where the company can "fire" you anytime, with a legally limited amount of money you can make, and less social protection. Which one would you choose?

Uber drivers are all under the "auto-entrepreneur" status. So their contract with Uber is a B2B where Uber can fire them anytime, ignoring the french laws on job protection. By using this status you are limited to a maximum income of ~32k€ a year, from which you have to deduce (reduced) taxes, car rental & stuff.

The auto-entrepreneur status was created to help people create a small one person company where they could sell their services/product. It is really popular amongst independant computer repair shops for example : less taxes, less paperwork, equivalent social protection but more limitations too.

As an auto-entrepreneur you are not supposed to have only one client, but if you do have only one client and get controlled, you will be the one punished for it and get your status automatically switch to a "normal" company status where you have to pay more taxes (and have to compensate for some previous monthes if I remember well), but by doing so you will use your Uber contract since Uber requires you to be auto-entrepreneur (otherwise the money they give you wouldn't be enough to live decently). And you won't be able to take the auto-entrepreneur status again because you go caught "cheating" with it. But Uber don't care, there are 10s of people to replace you.