Something interesting: a lot of people thought Airbnb was terrible, including YC and Fred Wilson.

I was 23 when Airbnb was founded. I had had many happy experiences with Couchsurfing.

For me, and many Couchsurfers, the idea of an upscale, paid couchsurfing was trivially obvious. None of us built it, but I assumed someone would.

I'm not sure what the lesson is.