If you look for it, you can find many donation by Pepsi / Exxon / The Home Depot Foundation / The Starbucks Foundation / Lowe’s / United Airlines and such (all the majors do, and many small companies do it , even if only for tax deductions....), they just do not make a fuss like Apple does..
I don't disclose if I do and how much if I do donate, that does not prove anything.
EDIT:
Just because it is not on paper (or screen) doesn't mean it did not happen, and just because it is (on screen) does not mean it did happen!