It says nothing about "asian people". Verbatim quote, in full:
> The contest is open to individuals or teams of individuals who are legal residents or citizens of the United States, United Kingdom, European Union, Canada, New Zealand, or Australia.
Interestingly if you follow through to the full T&C's [1], they add exclusions:
> ...not located in the following jurisdictions: Cuba, Iran, North Korea, Russia, Syria, and the following areas of Ukraine: Donetsk, Luhansk, and Crimea.
Showing that the only explicit exclusions are aimed at the usual gang of comprehensively sanctioned states.
Still doesn't explain why the rest of the world isn't in the inclusions list. Maybe they don't want to deal with a language barrier by sticking to the Anglosphere... plus EU?
It'll likely be to do with financial responsibility due to where the funding comes from. They have an obligation to check that they are not sending funds to a terrorist group to solve code bounties, etc.
> The contest is open to individuals or teams of individuals who are legal residents or citizens of the United States, United Kingdom, European Union, Canada, New Zealand, or Australia.