This echoes an independent study in January that said that just over 22 percent of Airbnb's revenue in San Francisco was generated illegally, by hosts violating local law. In their release today, the company says that these short-term, entire-home hosts with multiple listings represent 17 percent of total host revenue. Contrast these numbers with those that the company bandied about 10 months ago, when they asserted that only about 348 units were being kept off the long-term rental market and rented full time via Airbnb.