nitpick: Apple doesn't follow SemVer 2.0, but they do have a semantic versioning scheme, that is, the version components carry a certain semantic, it's just so that this semantic is different than the semantic defined by the SemVer 2.0 specification.
One can have any sort of semantic versioning that is not SemVer 2.0 compliant and still be useful, see e.g Rails or Ruby.
Even .Net assemblies are not SemVer 2.0 compliant: their pattern is maj.min.patch.build but SemVer 2.0 specifies that there can only be three conponents and build info must be behind a plus, like maj.min.patch+build