I think that this issue is really universal across all banks in Korea. I was told (but couldn’t confirm) that this is a liability question. Supposedly, there was a court ruling that held a bank liable for a customer’s losses due to lack of security precautions. So now all of them implement “security precautions” to avoid liability.
Thank you for the hint, I fixed the typo. Not being a native speaker, I had to ask a search engine what I did wrong in this sentence. :-)