Very tricky. Who you allow to stay in your home is a very personal and grave decision and people want as much information about the potential guests as possible. If they were to take this a step further and remove guest pictures altogether, I suspect that you'd see a mass flight to a competing platform.

For people who are renting out their primary home (and especially if they'll be there at the same time as the guest), I don't think it's ever right to challenge their decision to accept or deny a guest.

But someone running a number of units as full-time rentals should be held to anti-discrimination laws.