It's beginning to seem like the best approach to selecting software is akin to the best approach to shopping in a supermarket - stick to the edges and avoid the middle. In this case, the two opposite ends of the spectrum might be viable from a security and privacy standpoint - fully-paid commercial software and completely open FOSS are both acceptable, but the middle ground of commercial freeware is best avoided.
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It's beginning to seem like the best approach to selecting software is akin to the best approach to shopping in a supermarket - stick to the edges and avoid the middle. In this case, the two opposite ends of the spectrum might be viable from a security and privacy standpoint - fully-paid commercial software and completely open FOSS are both acceptable, but the middle ground of commercial freeware is best avoided.