When Gov. Andrew Cuomo signed a bill late last year to stop Airbnb hosts from turning their apartments into de facto hotels, bigger fines were supposed to deter a practice elected officials argued took much-needed apartments off the rental market.

But more than six months after city inspectors’ first round of enforcement, the de Blasio administration has collected only a fraction of the issued fines, which added up to hundreds of thousands of dollars, according to a Crain’s analysis. In large part, the trouble is rooted in the city’s long-flawed collection system—where cases and appeals can take months to process and landlords have little reason to pay up—which could ultimately defang efforts to curb illegal home sharing.