Comment by dmode

I always read this comment and and amazed how people here underestimate the complexity of running a large business with global reach and billions of dollars in transactions. Airbnb is in >100 countries and uses home grown payment system. Now imagine the number of currencies it needs to process and number of finance and tax laws that it needs to follow. Also, when you have traffic at Airbnb's scale, architecture and engineering becomes competitive advantage. Every millisecond of performance improvement or every last % of latency improvements lead to dollars. Finally, Airbnb is heavily regulated at the regional and city level. So I am assuming they require army of lawyers and ops people at these regions to comply. This is a start, and I haven't even touched the customer support side or defense against fraud and other malicious actors.