“We worked with the Safari team to ensure that some of the things that weren't there are there, and that allowed us to kind of get to where we are today,” Luna head of engineering and technology George Tsipolitis said.
I don't know if these APIs are secret, so much as didn't exist before. I assume that Google and Microsoft are free to leverage these as well now.
And fair enough, I haven't been a part of larger enterprise deals in my career so far.