I think the days of Airbnb being "rent out a spare room" are gone, whenever I look, most Airbnb properties tend to be used as dedicated short-term lets and has supplanted the old holiday letting market.
I've seen a mix. Some are definitely dedicated AirBnB rentals where it's obvious the owners are professional landlords; but we've stayed in ADUs where owners occupied the primary residences, cottages being rent out part-time, etc.
