Perhaps that's true. From what I read it shipped in a non-working state (manuals were there, but not some utilities were not), and I recall Apple engineers came out on Twitter saying it was being worked on and included it post-launch in macOS betas, even incorporating feedback. I believe Apple did tease at least Windows, maybe Linux in marketing, but I could be mistaken..

Either way, going after OS developers would be an extremely bad look for Apple, especially when they could just as easily disable the feature, or not have bothered finishing the implementation (or done it completely differently) after news of the Linux porting efforts started to spread (especially the Corellium public demo running Ubuntu).