Best example to me was eBay going from people selling used things to being almost entirely made up of storefronts. In Australia, Gumtree became popular as people actually selling used things, and then eBay bought them (I think they've sold it since).
Another example is Facebook. All about people and communities, and now a huge portion of it is business page management and advertising.
Hell, to satisfy me all they'd have to do is prove it's an actual BnB-type experience. Basically, prove the host lives on the property and it's either extra bedroom(s) or an ADU.
Maybe something implementing a few basic (naive?) rules:
1. A property cannot be listed for more than 120 days a year.'
2. One cannot list more than 2 properties.
So limiting to people that aren't actually making a business out of bnb's.