Nothing quite says "unintended consequences" like a diplomatic dispute turning into a consumer boycott powered by smartphone apps. That's exactly what's happening in Denmark right now, where residents upset about President Donald Trump's push to acquire Greenland are wielding their wallets as weapons against American brands.

The situation took a potentially positive turn Wednesday when Trump announced a possible deal between the U.S. and Denmark over Greenland. But the damage to American companies may already be underway, judging by what's happening in Denmark's app stores.

When Boycott Apps Go Viral

Two apps designed to help consumers identify and avoid American products have rocketed to the top of Denmark's download charts. NonUSA and Made O'Meter both let users scan product barcodes to see where items are manufactured and suggest non-American alternatives. According to TechCrunch, these apps are now fixtures in the top 10 most downloaded across both iOS and Android in Denmark and Greenland.

The numbers are pretty dramatic. NonUSA jumped from 441st place earlier in January to become the number one most downloaded app on Wednesday. Made O'Meter landed in fifth place. Together, the two apps saw combined daily downloads surge 867% over the last seven days compared to the previous week.

And here's where it gets interesting: the boycott movement isn't staying contained to Denmark. Downloads are also spiking in Norway, Sweden, and Iceland, suggesting that Scandinavian solidarity is a real thing when it comes to standing with Denmark against tariff threats.

Which American Companies Are Feeling the Heat?

Let's talk about the corporate casualties. Netflix Inc. (NFLX) is catching heat despite having nothing to do with Greenland policy. Danish residents are reportedly canceling their subscriptions in favor of local streaming options. For context, Netflix's EMEA region (which includes Europe) generated $3.87 billion in revenue during the fourth quarter, up 18% year-over-year. While Denmark probably represents a small slice of that pie, it's still an uncomfortable situation for a company that's built its business on global expansion.

Consumer products companies are another obvious target. Made O'Meter screenshots show users scanning bottles of Head & Shoulders shampoo, which is owned by Procter & Gamble Co. (PG). Danish consumers are apparently discovering for the first time just how many bathroom, kitchen, and laundry products come from American manufacturers. These boycott apps are essentially providing an education in supply chains, and that knowledge could hurt companies like Procter & Gamble across the region.

Coca-Cola (KO) is getting caught in the crossfire too. Made O'Meter is promoting Jolly Cola, a Danish alternative, as a replacement. The irony here is thick: Coca-Cola was already targeted in earlier Danish boycotts this year despite the fact that Coke products sold in Denmark are made by Danish workers in Danish factories under a licensing partnership with beer company Carlsberg, according to Reuters. Geography doesn't seem to matter when brand origin is the issue.

Travel is taking a hit as well. Danish residents are canceling U.S. vacations, with the Rejsekort travel app climbing into the top 10 most downloaded as users scramble to reschedule their plans. Airlines offering direct service to Copenhagen, including United Airlines Holdings Inc. (UAL), could see reduced demand from Danish travelers.

Market Reaction to the Greenland Dispute

The broader market hasn't been immune to the drama. The SPDR S&P 500 ETF Trust (SPY), which tracks the S&P 500, dropped 1.5% on Tuesday after Trump suggested higher tariffs on European countries supporting Denmark's ownership of Greenland. The Magnificent Seven tech stocks alone lost over $700 billion in valuation during Tuesday's selloff.

Stocks bounced back on Wednesday with the SPY climbing 1.2%, possibly reflecting optimism about the potential deal Trump announced.

A recent poll shows that most American voters don't support using military force or purchasing Greenland. Yet Trump's continued push on the issue is creating a situation where American companies become collateral damage in a geopolitical spat. Danish consumers are using these boycott apps to make a statement, and that statement is being heard in corporate boardrooms from streaming services to soft drink manufacturers.

The question now is whether Wednesday's announced potential deal will cool things down before the boycott movement gains even more momentum across Scandinavia. American brands operating in Europe are probably hoping the answer is yes.