They are exceptions in the sense that most of their software is proprietary, but they're still important core components. They also distribute a couple hundred open source packages with OS X: http://www.apple.com/opensource/
Apple is very sensitive about licenses, e.g. they've stopped updating OS X's GNU tools 6 years ago to avoid GPL v3.
I only know what's reported here on HN, but they mostly seem sensitive about copyleft, not open source in general.
OSM's ODBL is share-alike, so Apple probably didn't like having risk of share-alike apply to their proprietary data.
But they do use OSM data: https://twitter.com/openstreetmap/statuses/19810151220183449...
As they should be. The fact that they stopped updating because of GPL doesn't mean they don't support open source. Lot's of people will support MIT and BSD licenses, but not GPL3.
I.e either Apple want to sue people for using software technology which Apple themselves would distribute freely under an MIT/BSD license.
Or they do not want support open source projects with all the code related to those projects. I think this is the more likely culprit, which is in line with pornel comments that Apple probably didn't like having risk of share-alike apply to their proprietary data.
(Of course, if you are talking about distributing MIT/BSD software binaries vs GPLv3, all the other parts of GPLv3 need to be considered. This post only address the willingness to support open source projects with source code.)
Apple is very sensitive about licenses, e.g. they've stopped updating OS X's GNU tools 6 years ago to avoid GPL v3.
OSM's ODBL is share-alike, so Apple probably didn't like having risk of share-alike apply to their proprietary data.