Starbucks Korea is beginning to show visible signs of financial damage following the company’s politically charged “Tank Day” controversy, offering an early indication of how quickly consumer backlash can translate into declining sales inside South Korea’s highly connected retail market.
According to data released Thursday by AI analytics firm IGAWorks Mobile Index, Starbucks Korea’s estimated weekly card spending fell sharply during the week of May 18 through May 24, immediately after public criticism intensified over a promotion tied to the anniversary of the 1980 Gwangju Democratization Movement.
Weekly spending dropped to roughly $170 million from approximately $230 million the previous week, a decline of about 26%.
The figure also marked a roughly 25% decrease compared with spending levels recorded earlier in May, suggesting the controversy may already be affecting broader consumer behavior rather than creating only temporary online criticism.
The backlash erupted after Starbucks Korea used phrases including “Tank Day” during a tumbler discount promotion launched on May 18, one of South Korea’s most politically sensitive commemorative dates.
The anniversary marks the 1980 Gwangju uprising, when pro democracy demonstrators were violently suppressed by military forces during the country’s authoritarian era. The event remains deeply embedded in South Korea’s political identity and historical memory.
Criticism spread rapidly across social media and online communities, forcing Shinsegae Group, which operates Starbucks Korea, into crisis management mode.
The company removed the head of Starbucks Korea and issued a public apology. Shinsegae Chairman Chung Yong jin later personally apologized as well, acknowledging that the controversy had triggered a “significant decline” in sales.
The spending decline at Starbucks significantly outpaced broader weakness across the coffee industry.
During the same period, rival chain Mega MGC Coffee recorded only a modest decline of roughly 6% in weekly spending, suggesting the sharper drop at Starbucks was tied specifically to reputational fallout rather than broader consumer weakness.
The controversy also appeared to affect customer acquisition.
New installations of the Starbucks Korea mobile app fell about 24% from the previous week, while the app’s ranking among food and beverage downloads slipped from second place to fifth.
Industry analysts said the simultaneous decline in spending and new app downloads suggests weakening brand trust among both existing and potential customers.
At the same time, overall app usage actually increased.
Weekly active users on the Starbucks app rose nearly 5% as existing customers logged in to review company statements, check rewards balances and monitor refund related announcements following the controversy.
That pattern highlighted an increasingly important feature of South Korea’s digital consumer economy: mobile loyalty platforms can quickly become channels for both engagement and organized consumer backlash.
The controversy arrives even as South Korea’s coffee market continues expanding overall.
Separate industry data showed total spending at major domestic coffee brands reached approximately $7.4 billion in April, up 14% from a year earlier. Over the past three years, the market has grown roughly 32%, with Starbucks remaining the country’s largest coffee brand by total consumer spending.
For Starbucks Korea, however, the latest figures suggest the political controversy is no longer confined to online criticism. It is beginning to produce measurable commercial consequences.
