For reasons I don’t understand my work asked Craig McLucke to visit us, which he did. As he tells it, Borg was a pre-existing platform, Kubernetes came along as a part of a program to develop a replacement/furtherance of the Borg. The actual code name was Seven of Nine for that reason but legal couldn’t clear it with CBS/Paramount/Viacom in time for distribution.
This depends on the job and role, I know plenty people who tend to be flung at a project for 6-8 months, then pivoted to another, ad infinitum. For them, changing company etc is only slightly more inconvenient for them and the employer than shifting internally.