Playing on Apple's past "Switch" ad campaign, which was aimed at getting Windows users to migrate to Apple's Mac OS X-based computers, a few longtime Mac and open-source gurus are vocally publicizing their switch away from Apple's platform to more open-source solutions.

Though the practical impact is impossible to gauge, their arguments have been making waves.

The first was Mark Pilgrim, who wrote free software for the Mac in the mid-1990s.

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