According to various newspaper reports today, Airbnb was fined for posting an illegal sublet and not registering the sublets' rental of over 120 days.
In certain (all) arrondissements of Paris Airbnb was to patrol the listings and report those of over 120 days. (All rentals of primary residences for over 120 days are illegal but Airbnb agreed to report only those in the heavily touristed areas.)
This is particularly newsworthy because this is the first time Airbnb has been fined auguring more of the same for other platforms. (Airbnb is sometimes used also as the generic name for short term rentals)