Also, let's say hypothetically that Facebook does sue you for the patents covered by React. When to comes time to establish damages, the fact that Facebook is c

Also, let's say hypothetically that Facebook does sue you for the patents covered by React. When to comes time to establish damages, the fact that Facebook is currently giving away the licenses for free can be used to argue in court that their monetary value is zero. So even if you get hit with treble damages for willful infringement, the actual impact might not be as severe as one might otherwise suspect. (IANAL, don't try this at home, etc.)