Chrome was based on WebKit, and they bought Android (already based on Linux). Neither one was made from scratch.
Google certainly has the resources to do something like this. But neither of those projects (others mentioned Android) were started from scratch at Google.
And Fuchsia is using code from Chrome, Android and other open source projects. Not much these days is really made from scratch. iOS wasn't nor was MacOS or even MS-DOS for that matter.
Google certainly has the resources to do something like this. But neither of those projects (others mentioned Android) were started from scratch at Google.