Where do you want to start? The Internet collection and structuring the world's knowledge into a few key repositories? The focus on GPUs in gaming and then the crypto market creating a suite of libraries dedicated to hard scaling math. Or then the miniaturization and focus on energy efficiency due to phones making scaled training cost-effective. Finally the papers released by Google and co which didn't seem to recognise quite how easy it would be to build and replicate upon. Nothing was unlocked apart from a lot of people suddenly noticed how doable all this already was.