We used this pre-COVID to get out of a Brooklyn lease and had a fantastic experience (back when it was Flip Instant). Flip basically charged 1 month rent and guaranteed a fill or they'd pay the rest (6 months) of my lease. Compared to our landlord who wanted 1.75x rent, up to 2.75x rent if not filled immediately, after significant negotiation. Hiring a broker myself would have likely cost 1x rent or more anyways with…
The landlord is under no obligation to accept anyone this service finds, so this startup guarantees an outcome they cannot control. It might be a way to build awareness and goodwill, but they are burning VC capital to offer a service that is either fundamentally unsustainable or mispriced.
If someone brought me a tenant with good credit scores, income, and references, there's no way I would turn them down.
Why would they?