I'm not the person you are asking but I'll lay out how I understand this argument from what I've read about the housing market in Portland, OR, which has a big housing crisis right now.

Available housing, apartments, condos, etc, is being eaten up by short-term renters. The price of short-term rentals are more expensive than long-term rentals, but due to so much inventory not being free for long-term rentals, the price for long-term rentals has gone up a lot. This is the same inflation that we see in the expected vacation destinations but in non-traditional locations, like Portland and it's suburbs.

AirBnB is supposedly built to empower individuals to post a rental here or there. What has been found is that it has enabled and encouraged individuals and companies with large inventories to convert long-term rentals into short-term ones. And that 15% that AirBnB takes is simply passed onto the consumer - which then affects the price of long-term rentals.

Ditto for Toronto

Ditto for Prague

Airbnb makes no effort to control the legal aspect of people letting appartments on their site, nor do they give tax agencies the means to collect taxes. In fact, at some point, they offered their european renters to collect earnings on nameless credit cards from Gibraltar.

There is also the negative effect of renting prices going up, or having your neighbour replaced with 3-4 party organizers a month.