It isn't structured this way - I think your reading is slightly incorrect. What the FB licensed agreement says that is any patent grants which apply to reactjs

It isn't structured this way - I think your reading is slightly incorrect. What the FB licensed agreement says that is any patent grants which apply to reactjs/caffe2 will be revoked and FB will countersue for infringement on reactjs/caffe2 patents. I don't think a general agreement to prevent any kind of lawsuit is completely legal and acceptable in a court of law.