LLM summary follows:

The South Korean government has banned Starbucks vouchers after the company ran a "Tank Day" promotion on the anniversary of the 1980 Gwangju Uprising—when military tanks killed hundreds of pro-democracy protesters—and used wording that evoked a notorious torture death cover-up.

Tiny bit of context: Starbucks vouchers were the go-to standard for gift giving/promotional gifts in South Korea. They're not too expensive, and they don't explicitly show their monetary value, which I guess is a cultural thing(I wonder if any other culture also avoids giving something with an explicit face value).