You think someone goes to the trouble of developing an operating system from scratch, device drivers from scratch, all new applications from scratch, and then t

You think someone goes to the trouble of developing an operating system from scratch, device drivers from scratch, all new applications from scratch, and then training their staff to use, and then maintaining it? For what benefit? At that level of paranoia you'd run disconnected from public networks and security from remote hackers is a non-issue.