They knew landlords were running whole buildings in nyc as pseudo hotels, and they did little until now. [1]
They knew individuals were renting whole apartments 100% of the time, and did nothing.[2]
They refused to give data to the attorney general, and instead, mounted an AD campaign.[3]
Only after they were harshly penalized, did they promise to clamp down on the actual abuses.[4]
So they willingly let their customers break the law, because nyc is their biggest market, and well, now want to play the victim.
The spirit of AirBnB and the "sharing" economy is to share under utilized housing. Not to create illegal hotels.
[1] http://gothamist.com/2014/10/16/airbnb_illegal_rapacious.php
[2] https://www.bloomberg.com/news/articles/2016-07-07/wooing-go...
[3] http://www.businessinsider.com/airbnb-refuses-to-give-user-d... [4]http://www.nytimes.com/2016/10/20/technology/airbnb-proposes...