The idea that you should consider "what to do if your company grows to be a competitor to Google" in your technology decisions is quite frankly some of the worst bikeshedding I've ever seen. That question shouldn't even enter in to the process at the start.

If that happens, and it probably won't, but if it does you will have a team capable of dealing with the issue by then.

Considering that both Google and Facebook are heavily invested in this scene with Angular and React, there's not much to imagine. They're both fine with lots of licenses.

They will buy you first.

Acquisition by Big4 is not everyone's dream, imagine.