Apple not only uses standards-based compressed media formats exclusively, but the MPEG-4 file format is the QuickTime Movie file format (which Apple contributed to the standard).
One reason Google bought On2 and pushed VPx/webm/AV1 was because they didn't have video patents to use as trading chips in the cartel (On2 had several patents).
Full disclosure: I was co-founder of On2
As I'm sure you know, Apple joined AOMedia to demonstrate their support of AV1, and they're actively looking for Media Video Engineers with experience in AV1 and other video standards[1].
If there's been anti-standards gamesmanship, I'm not aware of it and would appreciate it if you'd share what you know.
[1] https://jobs.apple.com/en-us/details/200109105/media-video-e...
Today, Apple is every bit as monopolistic and anti-competitive as Microsoft was during Peak Ballmer.