Airbnb is basically just a prettier craigslist with a payment transfer mechanism and messaging. It isn't to say it isn't a great business, just that the "tech" part of it is not really much more than a web app.
Also engineering challenges aren’t always obvious from the consumer facing product. It is true that AirBnB founders have design backgrounds rather than engineering ones, but from what I’ve seen of their engineering and data science work, they would qualify as a tech company in my estimation. They did come up with Apache Airflow which is a well regarded data pipeline management system.
I'm just pointing out that the nature of Airbnb's business means that there's no real-time, no streaming, no billions of concurrent users, etc. The tech boils down to a 1) web app 2) payments mechanism and 3) messaging. Nothing particularly revolutionary on the tech side.
I guess I’m not sure why it is necessary for a tech company to be defined by these criteria? That’s just me.
I'm just pointing out that Airbnb's application of "tech" isn't necessarily "hard" tech, relative to other companies that it's usually associated with or compared to in the SF startup scene.
Internet schminternet.