I heard Korea had a problematic mandatory Internet login wall specifically built for IE with ActiveX on XP, and that that made use of Linux and/or Firefox complicated.

Funnily it lead to creation of PC F2P gaming culture too for some reason.

Running IE in wine wasn't always the easiest thing in the world, and when you were specifically running it to try and use weird integrations even less so.

This is a very good point. I didn't think about two things: (1) Internet Explorer, and (2) custom DLL with ActiveX integration.