>From an organizational-design perspective: That's the whole point. There's more to it than that. Unlike most other projects, these kernel teams were working

>From an organizational-design perspective: That's the whole point. There's more to it than that. Unlike most other projects, these kernel teams were working on the Linux kernel, which is an open-source project not under the control of any one corporation. These teams were simply maintaining their own kernel forks (which are undoubtedly optimized for their use-cases) and developing features/patches which they might try to submit upstream. And a lot of the work was undoubtedly device drivers for the particular hardware they used. Since they were working on very different projects (datacenters, Android, ChromeOS), with very different hardware, there was probably almost no overlap going on here.