Plus they are optimizing for a platform that may change without giving them enough time to adapt. At their scale, running their own servers is also important be

Plus they are optimizing for a platform that may change without giving them enough time to adapt. At their scale, running their own servers is also important because you are not at the mercy of anyone (except at the mercy of hardware and OS people, but who isn't?). Being able to adapt and upgrade at your own pace is important.