I think that's the main issue. One of the reasons housing is so expensive is because it's an avenue for investment/infinite growth. Maybe if you didn't have to outbid people that think houses are invesment you could have bought a house/afforded a mortage.

Land scarcity/livable land is the thing that makes housing expensive. Allowing people to use that to make profit is unethical.

That's not what's happening with AirBnB. That's turning the limiter supply of ownable property (condos and houses) into short term rentals for the owner's profit at the community's expense.

Also, I never said that outright banning is the proper option. Heavy taxation on strictly limited rental options (liter to a level where the community is still able to thrive) is also reasonable.