Earlier quoted context omitted.
One theory is that Elon Musk ends up being able to build AI datacenters faster and more cost effectively than anyone else, which seems plausible given the success of Tesla Gigafactories.
A few Chinese companies build both batteries and cars faster and more cost effectively than anyone else including Tesla though.
It could be close-to-free labor, subsidies, or a myriad other things... but it's something.