I'm curious how much their business model is centered around people organically going to their site and thinking "well, I'd like to go out for dinner somewhere

I'm curious how much their business model is centered around people organically going to their site and thinking "well, I'd like to go out for dinner somewhere - let's see where I can get a table" as opposed to arriving directly on a landing page for the particular restaurant from which they got the link. I know if I'm going to go to the kind of place that needs a reservation, I'll have one in particular I've got in mind, as opposed to thinking that I'm just interested in going somewhere that needs a reservation.