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I really like this approach to Open Source. It's an approach I so far have not seen, but that makes a lot of sense. So, yeah, good point you're making.
I'm not sure if Open Source is unstoppable, but yeah, it's strong and getting stronger by the minute. Even big corporations and governments are starting to see the benefit of Open Source. Of course, as with everything, there's downsides to Open Source, but those downsides (imho) don't weigh up against the many plusses.