I've never been a host so can't speak for multiple listings, though there seem to be a ton of services that try to market to multichannel listing, so "never" seems a pretty strong word here?

But, if the interwebs are correct, airbnb has 7 mil rentals, booking - 6 mil rentals (vacation specifically, not hotels) and vrbo - 2 mil

https://hosttools.com/blog/short-term-rental-tips/vrbo-vs-ai...

whatever advantage airbnb has, they are no longer the only game in town *

* depends on the town