SF is a ridiculously expensive city that people from across the US consider (who have homes even) consider themselves priced out of.
It seems mind boggling that people think everyone deserves a home in SF itself, instead of relocation to, say, a new suburb constructed a couple hours away (where housing is cheaper!).
Constructing that suburb would create jobs. The infrastructure needed to maintain it would create jobs. And even if it remains a net cash drain, it'll still likely be cheaper than 17B a year while giving people actual homes with opportunities to work their way up and out