@Mirmit
Hi, thank you for your answers !
You are perfectly right about the budget, it certainly miss at least a digit 
And indeed I think that the goal is to make the LoRa network a part of a bigger package around 'smart city' concept.
I hadn't joined the community yet, doing it ASAP ! Are there a lot of people yet ?
Again, for a more thorough exchange (and possibly a F2F meeting), you can contact me at the placeholder mail paris.lora.network@gmail.com