Won't the NDAs just cover existing native code you're embedding as binary blobs anyways?

Is binary Dart distribution really the blocker?

I'll admit I'm really sure how commercial flutter components would work, if not trust. I doubt anyone wants apps calling back to third-party license servers :)

Maybe, not... The commercial Dart/Flutter packages I've seen offer source access and support.

I suspect the problem would be promoting such a store.

For the record: it's entirely possible to make a custom pub server which requires authentication. And use those packages along with pub.dev packages