Regardless, the analogy only runs skin-deep. There is precious little you have to "give up" if you stop using proprietary software. (Ok, ok, gaming probably takes a big hit, but that's about it.) If you become vegan, you give up the vast majority of dishes you might find in the diets of most cultures around the world. (You even lose quite a bit from cultures that are largely vegetarian.) And the alternatives are just not the same, at least not yet. For many pieces of software, the open source alternative is comparable, or even superior.