Had Linux not existed, the world would possibly run on something based on a BSD kernel today, Google included. Maybe with a GNU userspace, maybe not. And Linea

Had Linux not existed, the world would possibly run on something based on a BSD kernel today, Google included. Maybe with a GNU userspace, maybe not. And LineageOS would probably have a hard time existing because the manufacturers would not be forced to release their kernels. We might have proprietary kernels optimised for Intel CPUs, too. The FSF might also have decided to continue the development of Hurd, or someone to write improvements to a BSD kernel under a GPL license.