Piyush Gupta left Abbott, watched his wife struggle with gestational diabetes, and decided the fix wasn't a better sensor - it was a cheaper one. A decade later, Ambrosia Systems sells glucose tech in 100-plus countries and just put the whole thing on your finger.
It started in a garage and now runs on custom silicon, a services machine, and a billion-plus devices that all talk to each other. Here is how the walled garden actually works - and why leaving it feels like moving countries.