It seems weird to hear "a company here in Japan called LINE" -- LINE is big enough in Japan that it sounds kind of equivalent to "a company here in America called Discord".
AFAIK LINE has not had such success. I wouldn't be surprised if most people in the US did not know of LINE, unless they were avid readers of TechCrunch or something it just doesn't come up.
Would be interesting to know what % of people on HN know about LINE though
https://www.statista.com/statistics/560545/number-of-monthly...