Tourists don't vote, residents do, and even if short term rentals were outlawed, Barcelona and Madrid would remain tourist hotspots (as they were before short term rentals).
Certainly, there is a tug of war between tourist dollars vs negative tourist impact, but this math is a function of how impactful tourist decline (if any) would occur by pushing out short term rentals. Hotels always remain an option. Real estate and politics are local, as the sayings go. AirBnB pushed negative externalities on local jurisdictions to achieve their valuation and economic success ("socialize the losses, privatize the gains"), and these efforts are just pushing them back in some form. Tourists should remember that they are guests in the places that host them, and it is a privilege to be hosted.
Certainly, there is a tug of war between tourist dollars vs negative tourist impact, but this math is a function of how impactful tourist decline (if any) would occur by pushing out short term rentals. Hotels always remain an option. Real estate and politics are local, as the sayings go. AirBnB pushed negative externalities on local jurisdictions to achieve their valuation and economic success ("socialize the losses, privatize the gains"), and these efforts are just pushing them back in some form. Tourists should remember that they are guests in the places that host them, and it is a privilege to be hosted.