you are giving Facebook a free license to your entire patent portfolio. It's bad, but it's not quite that bad. Theoretically, you could stop using React, then

you are giving Facebook a free license to your entire patent portfolio. It's bad, but it's not quite that bad. Theoretically, you could stop using React, then start the patent litigation. Then Facebook could not sue you for React because at the time litigation started you were not using the license. But that's definitely a high barrier to jump if you've built up react as a core part of web and/or native applications.