This is rough and maybe slightly off but the gist is that Korean banks (and other institutions) are required by law to use ActiveX and other IE-only technologie

This is rough and maybe slightly off but the gist is that Korean banks (and other institutions) are required by law to use ActiveX and other IE-only technologies which had (has?) kept IE's browser share ridiculously high (with most on older versions). I lived there for a few years and worked with Macs. I was completely unable to access my bank account online. Even when I could log in on a Windows desktop, there's an extremely overly-complicated (and quite manual) certificate system also required.