There is no local monopoly France. (for ADSL, not speaking about fiber here).
All of the "last-kilometer" connectivity is owned by the historical telephony operator France Telecom (also known as Orange after its privatization), which has the obligation to rent it to other providers. You can switch between all country-wide ISPs as you wish.
All of the "last-kilometer" connectivity is owned by the historical telephony operator France Telecom (also known as Orange after its privatization), which has the obligation to rent it to other providers. You can switch between all country-wide ISPs as you wish.