Where do hosts go when they have rented out their home? To another host"s house, obviously! I think the point is that if you are renting a house and your landlord doesn't want to rent it back out, then he or she can just keep it.
Where do hosts go when they have rented out their home? To another host"s house, obviously! They simply sign up at canistaywithyouwhileIrentmyplaceonairbnb.com and away they go, the service is free, but does suggest some form of compensation like a six-pack of beer, or an offer to swap hosting duties at a later date.