Linux had many reasons for its success, but overall governance was definitely one of them. People felt free to contribute meaningful code in the knowledge that the GPL would “defend it” against a future as free fodder for corporations. Corporations treated it with kid gloves because they were scared of the GPL, and this left the ecosystem free to breathe; and Microsoft’s all-out war on the “communist” licence effectively solidified a front of motivated contributors in a way that the existing BSD efforts had never managed to.