Also, no state-actor would ever blow an immensely costly and rare backdoor like that on us peasants here. Even, if you would threaten to kill all the puppies. That's the sort of thing they reserve for state-level shenanigans, 100% targeting servers, infrastructure and industry, not individuals.

Though, I also doubt, they would just shelve these epic exploits, since a universal Linux backdoor likely puts themself at risk too, unless you can pull off a grand conspiracy, or deliver patched packages to your own people without questions asked. Maybe a completely locked down country like North Korea could do it. I doubt many other countries got an incentive, unless in preparation of a specific attack.