[swhipple]

While open source software and free software refer to roughly the same set of software, the ideology is different.

Open source is about collaboratively building tools for developers and businesses, or simply because collaboration produces better software. The software is often released under permissive terms. Apple participates in open source projects.

Free software is focused on the end user having freedom over their software by ensuring that they have the ability to read, modify, and redistribute it. Apple does not give these rights to users of their platforms.

The post that was linked was the FSF, which argues from the free software perspective.