I see the point, but that's "whataboutism." I also have no idea who owns the copyright (if anyone does) to stdlib APIs, and whether Oracle obtained license. Do you?

> (if anyone does)

There's no doubt that if it is established that APIs are subject to copyright, then someone owns copyright to the C standard library APIs. It's not old enough for copyright to have expired, and nobody has ever released the APIs to the public domain (because nobody ever seriously thought that such a thing would be necessary). Establishing API copyright as a real thing without broad fair use rights would throw into doubt the copyright ownership of a large portion of all software ever written.