Cramming extra family/friends into an apartment who aren't officially on the lease (e.g. the adult son who's lost a job or is on parole, or the parents who can't afford assisted living and are helping raise the grandkids) is actually far more common among low-income, rent-stabilized, and minority tenants. Stopping short-term Airbnb leases isn't particularly controversial; it's going after the medium/long-term unauthorized tenants that really has a disproportionate impact on the underprivileged.
I would have a problem with unknown, unvetted, random AirBnb users coming in an out where the host doesn’t really know anything about the person and won’t be there.
But it's arbitrage. The market rate is $4000 but the current tenant is paying $1000 and subletting for $3500. The inconvenience is worth $500/month, and you can't just go directly to the landlord to cut a better deal because the apartment is already "occupied" by the tenant paying $1000 who the landlord can't remove.
I'm talking about a subtenant retaliating against a prime tenant who kicked them out. Getting the prime tenant evicted is easy. On average, they're easier to find and collect from. Suing to take over the lease is hard, but collecting from the landlord is easy.
Having subleased to a legitimate person before, it's already annoying/stressful enough to be a sublandlord since you are taking on a lot of credit risk as is. If I'm in a position where I'm going to shadily rent out my below market apartment I'm not going to rent it out to someone that a normal landlord otherwise wouldn't pick.
It's a lottery either way. Either there's a problem with lotteries in general or a problem with what kind of person is allowed to win them.
Honestly, I agree it is would be kind of messed up for someone to have the fortune of winning a below-market luxury apartment and turn that around and illegally rent it out for a massive markup on Airbnb.