Earlier quoted context omitted.
There is also a major difference as I understand it. They need to be resolved at the end of a certain period. There is a legal difference from Credit cards as in there is no continual liability and thus no continued line of credit. Getting a true credit card is also a lot harder here (not France) than a deferred payment card (usually 1 month) and has stricter credit checks.
It's more taboo to talk about revolving credit card than crack addiction for a french. I don't know a bank that offer them, even the shady online bank.
Things have been changing a bit in recent years. Since the "debit" and "credit" nature of the card is now written on them, French folks have started to request "credit" ones for travelling (to rent a car for instance).
My understanding is that for car rental purposes, anything using Visa/MC (and not a national debit network like Visa Debit in the US) will work, it doesn't actually need to be backed by a revolving credit. At a US gas pump, a Frenchie needs to select "credit" even though the card has "debit" written on it. Still, should the clerk refuse the card because it reads "debit" without running it... better have this "credit"-labeled one.