In other words, the code is free until it is added to, becomes proprietary and - if a network effect adheres - then that proprietary version can dominate and in effect extinguish the public domain version. Certainly extinguish nearly all its value. The once-again-enslaved code lives and thrives, the freeman code perishes, or nearly so. That's a good argument, but the whole problem is created by an IP system that perverts the concept behind copyright. Paintings don't prevent other paintings from competing, code with a network effect or lock in does. Copyright should either never have been applied to code, or be for a very short period. Let's say, four years or eight years. Then BSDL code going proprietary isn't a threat, it's a bonus: more free code soon enough.
