[buliam]

I’m not sure that in the scenario you’re suggesting (Facebook copying your app) you would have any legal ground to stand on to sue them regardless of whether the app was made with React Native or not. This is based on the fact that Snapchat also didn’t sue Facebook for copying their app/features, even though they would presumably have the financial resources to do so, which, I believe, is not the case for most of us here.

I just started http://madewithreactnative.com where I’m interviewing developers and teams who have made apps with React Native and none of them, so far, have mentioned anything about the license, so personally I think you should go for it (obviously biased opinion, since I am quite fond of React Native).

And even if you are not going to use React Native in any of your own projects I still think learning it could be beneficial as you could leverage that knowledge to make apps for other people, in which case you personally wouldn’t have to worry about any legal issues.