What serious business hosts their proprietary, mission critical code on someone else's computers? Isn't that like Coke or KFC putting their original recipe on G

What serious business hosts their proprietary, mission critical code on someone else's computers? Isn't that like Coke or KFC putting their original recipe on Google Drive? Edit: Okay, I get it. People like convenience over security. I'll stick to self-hosting a Drone-CI instance and only deploying binaries.