Judging by how keen they are to never adopt anything ever written by anyone else, I think it is precisely the opposite. They have a "not invented here" syndrome that causes them to keep hold of everything they create to be in full control of it. It makes sense commercially. Examples: a. Swift language - they could have just used C# but decided to create Swift to force yet another generation of developers to learn the language only used by Apple (same as Objective C) b. Their chips on their phones / iPads c. The soldered-on SSDs on their laptops instead of user-replaceable items d. APFS - their "new" filesystem is still lightyears behind NTFS in terms of features - why didn't they adopt NTFS instead???

Heck, even sharing files from your Mac to your Apple TV needs Apple's blessing before it'll AirPlay to it (via iTunes, not sure on whatever they're using now).

They will never ever ever ever adopt the Linux kernel.