The difference you're missing is that the Apache 2.0 terminates if you end up in a patent dispute related to the software. Facebook's parent grant terminates i

The difference you're missing is that the Apache 2.0 terminates if you end up in a patent dispute related to the software. Facebook's parent grant terminates if you sue them over any patent. So hypothetically if Google released some JS frontend library under Apache 2.0, I don't lose the patent grant if I sue them for violating my company's VR patents, whereas I do lose my patent grant to React if I sue Facebook for violating my VR patents. My company happily uses React, because we don't believe that's a risk worth worrying about, but it is a difference, and it might be relevant to some.