I suspect it's just simple math. In the same way that Windows deployments vastly outnumber mainframes, (large scale server) Linux deployments vastly outnumber Windows. FAANG (and want-to-be FAANG) companies have been hammering away at Linux for decades with workloads that have grown to scales Windows has never seen. For example, how many billion user web services are running on Windows? What percentage of supercomputers today run Windows? etc.