I don't know about the others, but this is not a description of YC. The whole point of YC is to focus on real work. The first thing we tell the startups we accept is that they should build stuff and talk to users (and exercise and spend time with their families) and nothing else.
When the Airbnbs came to speak at the last dinner, Brian Chesky said that the 3 months of YC had been the most productive time in their lives.
When the Airbnbs came to speak at the last dinner, Brian Chesky said that the 3 months of YC had been the most productive time in their lives.