Well, it may not be true, but I have run into it at least a dozen times.
I love airbnb and have used it for at least 1000 nights world wide, but I tend to avoid it here in Argentina.
As a guest, there is no easy way for me to tell if the apartment host is saavy and has a US bank account or if they are less sophisticated and just set it up with their Argentine account.
On my last attempt to use Airbnb in Argentina, I contacted a host with questions, they sent me an invitation to book, and I accepted. Shortly before my scheduled arrival, the host contacted me and asked me for more money. I refused to pay the extra and mentioned that I would only the pay the price agreed upon previously. They told me the the price we agreed was a mistake. They wrote that I was being an cheapskate and that I was taking advantage of them and that I was insulting them by refusing to pay the higher price. I told them the exact price in US dollars that I was paying for the rental, and they thought that was a fair price, but that the price I said that I was paying was double the price Airbnb was giving to them. I contacted Airbnb customer service, I told them that the host had just contacted me and wanted me to double the price. The reservation was cancelled within a few days.
I believe you that sophisticated hosts can easily manage a rental unit, but from the perspective of the customer, the process is too error prone and it is a pain in the @ss to have to cancel a booking and try to set up another rental on short notice. In my experience, Airbnb is less than helpful or understanding of the customer's predicament when they have made travel plans and their lodging falls through at the last minute. When something happens like this -especially in a tight apartment rental market-as a customer I feel that Airbnb has wronged me. yes, I get the money back, but the whole point of a website like Airbnb is that you can plan in advance. When something falls through, the customer is basically just screwed.
So in short, its just not worth it, when other avenues for short term rentals like zonaprop, argenprop, mercadopago, and instagram are available.