As a foreigner who's spending a lot of time in South Korea and had to deal/saw people deal with the inability to do anything online without the use of a Windows client, I applaud this. Every time we need to interact with the government or a bank, we need to search around for a Windows laptop or try from a VM (doesn't always work). This makes it very hard for anyone to learn a non-Windows OS.

Next step: remove the silly Korean phone number requirement from your online services.