Airbnb's harder to clone because Dropbox is just file sync (solved by OneDrive, Google Drive, iCloud) while Airbnb needs a two-sided network of trust, local inventory, and regulatory relationships that take years to build in each market.
You can clone the Dropbox homepage in an afternoon; you cannot clone 18 years and billions of dollars of distributed storage engineering.
Full teardown →You can clone the homepage in a weekend; you cannot clone 19 years of trust, liquidity, and a global host network worth tens of billions in bookings.
Full teardown →