The article said:
Linus Torvalds kicked the Russians out of Linux
No, it wasn't Linus. He & the other core maintainers were following the advice of their lawyers, who were advising them on sanctions compliance. Those maintainers live in countries where such sanctions are applicable and they need to make sure they're following the laws of where they live and work.
The second paragraph more or less explains this, so why does the headline throw Linus under the bus?
(or out of a high window, so to speak)
The article said:
Another Russian expert pondered over the potential increased difficulty in tracking updates in the repositories of other projects to port them to domestic distributions.
This is the real issue they face. You can fork Linux, but then it becomes increasingly difficult to benefit from everything going on upstream, as your fork grows increasingly out-of-sync. At some point, they could diverge to such a degree that you can no longer deal with all the conflicts from rebasing, and your fork basically becomes orphaned.
The real value of Linux is in the way all industry players are working in a common codebase - it's a type of
Network Effect. Once you lose that, you might as well not even be using Linux any more.
There are plenty of other open source operating systems out there, but they all pale in comparison to Linux, other than in highly specific niches. If you want a general purpose cloud/datacenter/HPC OS, nothing matches the functionality and hardware support of Linux.