This isn't an argument. In most countries you have some local competitors that do better than global brands. Not every app has to be a global success to be highly profitable

Korea has KakaoTalk that's undefeated as the defacto chat app (and now search engine and payment provider). It's not doing well in every other place except Korea.

Japan has LINE as it's primary messenger, payment app, etc. It has some foot in other south-east asian countries but the strongpoint is still Japan.