> You lose the patent rights if you sue Facebook for any patents that involve React I see nothing that limits the termination clause to patents involving React

> You lose the patent rights if you sue Facebook for any patents that involve React I see nothing that limits the termination clause to patents involving React. The only limitation following those general lines is the one you quoted, which is a limitation on the exception, implying that the license does terminate if the patent over which Facebook sued you is a React patent.