In reply to Otto.
I generally don’t try to infer intentions of a company by reading their contract language. I read the contract with the understanding that it alone will be exhibited in any legal proceeding. I’ve never been in a court where the judge called for the review of intentions.

With that perspective, re-read the license and tell me if you get to the same conclusion, given this scenario:

a. You are a SW company that incorporates React as a key technology in your product.

b. You later find that FB is infringing on your intellectual property, so you file a legal complaint against them.

Are you confident enough in the written contract to conclude that since you are not a nasty patent troll FB will forgo their right to revoke your license?

Or, will they see the leverage they have over you and act upon it?

(hint…it’s the second answer…)