[bpicolo]

https://code.facebook.com/pages/850928938376556

It's purely defensive, they'll only revoke your license if you sue them for patent infringement. And they only revoke the patent-grant of React as far as I can tell, not your license to use it (and there aren't any patents related to React as far as the internet claims).

[DenisM]

Which in turn means they can infringe on any of your patents with no consequences. If they do, your only choice is to rewrite your entire application in a hurry, and only then you can sue them.

[tracker1]

Of course if you use a similar competing technology and choose to sue them over patents, they could still find you infringing and sue you anyway.