Apple's phone market share in South Korea is a moderately healthy 22% given the presence of strong domestic and regional brands, but I've no doubt Apple would sooner give up on South Korea altogether than have a weird law tying their hands globally.
If Google forbade a korean dev from making an international app with external payment provider, then SK could very much punish Google SK for it. Doesn't matter if the target users are in Europe. Read the GDPR, same principle.
Actually this is not true. It only applies to companies that are providing services to people physically in the EU. If you're an EU citizen but you're in America, it does not apply.
> When the regulation does not apply. Your company is service provider based outside the EU. It provides services to customers outside the EU. Its clients can use its services when they travel to other countries, including within the EU. Provided your company doesn't specifically target its services at individuals in the EU, it is not subject to the rules of the GDPR.
https://ec.europa.eu/info/law/law-topic/data-protection/refo...