We are not mapping legal definitions. 

And that would extremely difficult. I do not know the French laws and regulations. But in Denmark many caravan sites are considered camping sites according to the camping regulations, even if tents are not allowed. But that depends on whether the parking (but not services) is commercial, the number of plots (less than 4 on farms is usually not camping, permits, exceptions etc).
In fact stellplatz's are normally considered camping in Denmark. The 450 CAMPING-CAR PARK sites would legally be camp sites in Denmark even if most of them only accepts motorhomes and not tents.
  
What matters for data consumers/users is whether it is a place for motorhomes or a camping site. There can be some grey ares, but then we pick the best match.

And btw we have the same issue with tourism=chalet many of which are incorrectly tagged as tourism=camp_site even if you cannot use our own tent, caravans or RV's.