Is the linux kernel and gnu userland a bastion of security? Of course not, but it is still magnitude orders better than M$ counterparts for a multitude of reasons. Not even M$ runs windows as a baseplate on Azure. It is a net positive for humanity if more people and orgs ran linux based operating systems.
On BSD you use FIBs to declare process specific routing tables, on Linux you use firewall marks to do the same, then just route all trafik through the vpn uplink and deny any other.
"They used physics to do it" is just a laughably pathetic motivation. Nobel hated "abstract wankery" or "intellectual masturbation" and wanted to promote results which benefitted the common man and society directly. This is incidentally also why there doesn't exist a Nobel prize in economics. The nobel prize comitte has since long abandoned Nobel's will in this matter and it is anyones guess what the order of magnitude of spin Nobel's corpse has accumulated.
They weren't just catching up, the US had nothing, Ericsson had nothing and Huawei had functioning 5G base stations deployed. It took Ericsson another 6? months to get even basic shilled 5G of the ground.
Is the linux kernel and gnu userland a bastion of security? Of course not, but it is still magnitude orders better than M$ counterparts for a multitude of reasons. Not even M$ runs windows as a baseplate on Azure. It is a net positive for humanity if more people and orgs ran linux based operating systems.