Unless I’m missing something, it isn’t any different, other than it makes the market more efficient (in that the price gets set “correctly” earlier - by the manual method, a landlord likely over-prices initially and waits for a tenant OR underprices initially and loses that income).

It’s just in a broken market - there isn’t enough supply of housing, so prices are going up. And because everybody needs housing, it feels icky to many people (I’m one of them, but my solution would be relax zoning and allow more housing).

Unless using this system requires participants to set a price, I’m not sure it meets the definition of price fixing. A landlord can still underprice to guarantee a tenant quickly. Or overprice in the hopes they catch a low-info, high-income tenant.