I also expect a high moat, especially regarding training data.
But the counter for the high moat would be the atomic bomb -- the soviets were able to build it for a fraction of what it cost the US because the hard parts were leaked to them.
GPT-3 afik is an easier picking because they used a bigger model than necessary, but afterwards there appeared guidelines about model size vs. training data, so GPT-4 probably won't be as easily trimmed down.
But the counter for the high moat would be the atomic bomb -- the soviets were able to build it for a fraction of what it cost the US because the hard parts were leaked to them.
GPT-3 afik is an easier picking because they used a bigger model than necessary, but afterwards there appeared guidelines about model size vs. training data, so GPT-4 probably won't be as easily trimmed down.