Don't pay attention to this. It's a political side-show by a Supervisor trying to rally her base.
This is in the same vein as the "ban corporate cafeterias" shenanigans last year. It won't fix anything and the politicians yammering about it don't actually care about this.
It's all a game.
The real solution, of course, isn't saving jobs that don't pay enough money to actually live in the city. It's building housing. But that's politically difficult, so we get this.