How about academic institutions?
Good idea, I suggest we write to the University of California and suggest they help us and craft an operating system and associated programs we can base our work on. Whatever happened to Xenix? If the University of California, Santa Cruz, could acquire the rights and a form a student organization to manage the codebase. We could look forward to the Santa Cruz Organization version of Unix, or SCO Unix for short.
Here's the thing though: any choice in this arena will almost certainly be in the zone of Normal Accident Theory. Most companies do not have their own fabrication teams, nor programming teams large enough to code entire operating systems plus all of the other software they might need.
They're buying computer hardware, premade, from a major vendor.
They're running a Windows version of some sort, or maybe some Unix/Linux variant. (Side note: Apple has basically given up even trying for the enterprise systems arena, and MacOS is a forked Unix variant so that Apple can barely-legally steal FreeBSD and NetBSD's code, write their prettified front-end, and never give any code back to the community.)
Antivirus / anti-malware and other intrusion detection are likewise purchased services from SOME company. If it's not CrowdStrike, it's one of their competitors.
Would it help if organizations used multiple systems? If they had three Antivirus vendors and only 1/3 of the Windows computers had CrowdStrike, the other 2/3 would not have been affected. For best results you would probably want to make sure an entire department is not running the same combinations, a three person accounting team would have each person using a different antivirus. A brief search revealed CrowdStrike had issues with Debian a few months back, assuming they don't crash at the same time you could have CrowdStrike as an antivirus and differentiate by using different Operating systems. It is my understanding that genetic diversity is useful for populations instead of monocultures when talking with people that have some understanding of biology. Is there any reason the concept wouldn't help if applied to software systems?
About a month ago there were several news reports about CDK Global having issues and car dealers reverting back to paper. I vaguely recall fuel disruptions because of the software used by a pipeline company. Can we create two new esports for disaster recovery? Companies can start with a bare metal system and restore from backup as one competition. Another competition could be reinstalling all of the programs from scratch and importing the data to regain a functioning system. Both would be timed events, possibly bragging about high scores in the quarterly earnings report.