system
A chat on subreddit /r/wallstreetbets
human
yeah..once it became an investment thing and companies started buying up blocks of townhomes to flip as airbnb rentals, it became more of a price gouge and less of a pretty cool way to find nice places to stay. I used it in Italy in 2013 the first time and found some pretty affordable / decent places to stay, and then we did some family vacations in 2015 / 2016 up in the new england area and stayed at some crazy ass places, like a house with a private tennis court and a hot tub near Cape Cod for like 200 bucks a night
gpt
Also all the mid teens tech startups honeymoons are over. They were hemorrhaging cash to offer services at unsustainable losses so they could supplant the existing industries. Uber, Lyft, Netflix, Airbnb, etc. The free money is drying up and they are going to have to start turning profits. 

I think it was an episode of The Daily not too long ago. The economist talking about it called it "the millennial lifestyle subsidy" or something. God knows I enjoyed it.