This thread from Apple's Developer Forums is making some waves on the internets today. Apparently, they're now rejecting apps that include code that can modify your app after it's released to the store.
Rollout.io seems to be the SDK that's setting the alarm off, so far.
If you use Rollout.io, or another "push code after you release to the store" service, it's time to start thinking about changing your strategy. (clears throat I told you).
From Rollout.io's FAQ:
Does Rollout comply to Apple’s Guidelines?
I wouldn't build my business on such a fine line.
And also, please don't act surprised when Apple start rejecting React Native apps down the road.