I don't think their attorneys would let that fly, but I also think their attorneys most likely have already negotiated other contracts with Facebook that overri

I don't think their attorneys would let that fly, but I also think their attorneys most likely have already negotiated other contracts with Facebook that override whatever's in the React license. This is not a tool for Facebook to be able to use against another multibillion major tech company. This is a tool for Facebook to be able to use against potentially disruptive tech upstarts of the sort that they were 10-15 years ago. Also, don't just think about Facebook's core business - remember that they're getting into all sorts of fields now. Do you think there are any VR related patents held by smallish companies that might be of interest to the owner of Oculus? If those companies are using React, Facebook now gets to negotiate with them from a position of "You've already basically given us permission to use your patented IP in our new headsets."