Maybe criminals like staying at Airbnb. They have the cash after all and Airbnb can easily be used to hide ones identity.
It is not possible to be anonymous in AirBnB, to rent a flat they will ask you for multiple ID documents so they could confirm who you are, furthermore there is scoring system so anything fishy about guest or host will stay in the permanent record. I have used AirBnb a lot across the world, and overall I have not had any significantly bad experience.
Airbnb primarily relies on its review system to ban people. this unfortunately has nothing to do with what you do for a living (instead it's determined by the level of luxury you provide as host and/or whether you damage the place as a guest).