This is not true. Many companies want a CLA because their lawyers are worried about unclear patent law. They don't want someone to contribute some code, and the

This is not true. Many companies want a CLA because their lawyers are worried about unclear patent law. They don't want someone to contribute some code, and then later claim the contributed code violates their patents. Good examples are React from Facebook, and TypeScript from Microsoft. Both require a CLA. But these projects are never going to go closed-source. They are complements to the companies' core business strategies.