And they are only doing this in the big cities where there is plenty of competition. When I've stayed at sketchy AirBnBs, it was not a surprise. The real problem is in the boonies where there might only be a couple places available in an area and there is a shortage of experienced hosts. I recently left a 3* review (only one 4* out of 24 stays) for a place 30 miles outside Cleveland. Place was a dump with an absent host who had me call the cable company to fix the WiFi and then gave me a runaround for weeks when I asked for a discount. Three butter knives in the silverware drawer, bedroom door that had no key so God help you if you locked it. But it had great reviews!