All YC companies build technology, however many (most?) are building technology for markets that traditionally have not used technology in a modern way. These a

All YC companies build technology, however many (most?) are building technology for markets that traditionally have not used technology in a modern way. These are things like cleaning (HomeJoy), flower delivery (Bloomthat), t-shirts (Teespring), etc etc. Theses technology enabled businesses are the ones that primarily use web/mobile, and thus all the jobs.