Since December 20th, contests organizers in France are not obliged to file their set of rules with a bailiff anymore.
It can be viewed as a good news: it will decreases campaign’s costs. But one has to be careful: in certain cases, it might still be useful to do it.
Also, you should not mix up the deposit with the set of rules itself. Drawing up some rules – with our without filing them – and make them available to contest participants is still strongly advised, for it clarifies the rules of the game or contest and may help you in case of dispute.