Regarding your second point -- that also includes the fact that you cannot sue any of the React contributors, not just Facebook. If I have a pull request on React, I can copy everything you ever built on React, down to the interface. It doesn't matter how much I copy because you cannot sue me without losing license to the very thing you used to build it, and thereby not having right to build it in the first place. Read the agreement in full, till point (iii).

> (iii) against any party relating to the Software.