Almost 50 cities in France have already done away with paid tickets... "Nearly three million people in France can now use urban public transport without paying a fare. That number is likely to grow after the municipal elections... given the proliferation of proposals to make urban transport at least partially free."

https://www.lemonde.fr/en/economy/article/2026/03/12/french-cities-steady-march-toward-free-public-transport_6751388_19.html