One of the booking web sites (Trivago, I think?) is running an ad that implies that some of the other booking sites only have access to a subset of a property's

One of the booking web sites (Trivago, I think?) is running an ad that implies that some of the other booking sites only have access to a subset of a property's available rooms, which suggests that in _some_ cases the "last one!" nudge may be accurate, if misleading. Given the history of dark patterns used in that industry, I hesitate to give any of them the benefit of the doubt, but it's something I made a mental note to dig into at some point.