I used Airbnb (in a basement rental apartment ) the last time I visited San Francisco for a week. It was way cheaper for us and more centrally located than any hotel could have been. We enjoyed the experience greatly. This change means that I'm not going to be spending my next vacation in San Francisco. I'm sure that Daly City would be nice.

"... — the rental giant’s refusal to provide the names, addresses and guest stays that would be part of a mandatory registration system for hosts."

there's no reason at all that the City of San Francisco needs to have any of my information just because I'm spending a few nights there.