> Researchers from Northeastern University reviewed data in Boston from 2011 to 2018, a period of both sustained growth in Airbnb listings and growing concerns about crime. They found that certain violent crimes—fights, robberies, reports of someone wielding a knife—tended to increase in a neighborhood a year or more after the number of Airbnbs increased—a sign, the researchers said, of a fraying social order.
It didn't say how many neighborhoods were analyzed. It any case it's nothing more than correlation within the data of one city. I have nothing good to say about Airbnb nor this study (as it's being described).