Control vs. influence: Which way for open source?

Apparently, all that’s stopping the music industry from returning to its former glory is its failure to punish people who download music without paying for it. But if that’s the case, why did music sales in Japan fall when downloaders of unlicensed content were slammed with draconian penalties?

The same reverse effect applies to open source. Why do open source projects with a vendor tightly controlling the code usually fail to grow? Why do open source projects with relaxed licenses still get plenty of code contributions, though the license does not require them?

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