That's quite a broad assumption based on anecdotal evidence, you know what's true based on your few experiences renting and from a few listings your immediate family has, how can you even believe it's true based on this flimsy data?
Quick edit: just searched on both VRBO and Airbnb for rentals in my city for the same date range, VRBO shows me 191 options, Airbnb shows 330 options.
My point already shows that your whole assumption is flawed, which was entirely my point... You don't need to argue but it'd be in good faith to at least acknowledge that your point has no basis at all, it's just your feeling, not a point.
By the way, I live in a capital city in Europe so the discrepancies between listings would probably translate to many other places...
Quick edit: just searched on both VRBO and Airbnb for rentals in my city for the same date range, VRBO shows me 191 options, Airbnb shows 330 options.