Based on the search results, there are several factors that may have contributed to the decline of Airbnb, including:

• Government crackdown: In New York City, Airbnb has been hit hard by a crackdown on short-term rentals, which has made it more difficult for hosts to rent out their properties.

• Poor user experience: One user on Hacker News cited a poor user experience as the reason for Airbnbs decline.

• Fake listings: Airbnb has been cracking down on fake listings, which have emerged as a major problem for the platform.

• Criminal record policy: Airbnb has faced criticism for its policy of removing users with criminal records, which some see as "antihuman".

Its worth noting that while these factors may have contributed to Airbnbs decline, the company is still a major player in the vacation rental market and continues to operate in many cities around the world.