A wave of antitrust interest is washing over Europe and much of the United States, and Spotify is riding its crest.

The Swedish audio-streaming giant lodged a complaint against Apple with the European Commission on Wednesday, accusing the company of abusing its position as owner of the App Store to stifle competition. Specifically, Spotify says that by charging a 30 percent tax on in-app purchases, Apple forces app developers to make an impossible choice: Either pass those costs on to consumers, or refuse to pay the commission and face a litany of technical hurdles imposed by Apple. Spotify, which competes directly with Apple Music, argues that this constitutes an unfair advantage for Apple.

"Let me be clear that this is not a Spotify-versus-Apple issue," Spotify's CEO Daniel Ek wrote in a blog post. "We want the same fair rules for companies young and old, large and small. It is about supporting and nurturing the healthy ecosystem that made our two companies successful in the first place."

“The Commission has received a complaint by Spotify, which we are assessing under our standard procedures,” a spokesperson for the European Commission said. Apple did not immediately respond to WIRED's request for comment.

Determining what a healthy ecosystem should look like, particularly for the tech industry, has been a popular topic for debate lately. In the US, Senator Elizabeth Warren (D-Massachusetts) is taking on the issue as part of her run for president. In a much-discussed policy proposal released last week, Warren said she wants to prohibit tech companies like Facebook, Google, and Amazon from being participants on the platforms they own. Her plan, which was applauded by anti-monopoly groups like Open Markets Institute, would prevent Amazon, for instance, from selling Amazon-branded products on its own marketplace, and would require Google's ad exchange and Google Search to be split apart. Over the weekend, at South by Southwest, Warren explained that such a plan would also mean breaking up Apple and the App Store. "Either they run the platform or they play in the store. They don’t get to do both at the same time," she said.

That suggestion elicited swift criticism, including from Stratechery's Ben Thompson. "Is Senator Warren seriously proposing that smartphone be sold with no apps at all? Was Apple breaking the law when they shipped the first iPhone with only first-party apps?" Thompson wrote. "At what point did delivering an acceptable consumer experience out-of-the-box cross the line into abusing a dominant position? This argument may make sense in theory but it makes zero sense in reality."

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Spotify's complaint takes a different approach. Rather than arguing that Apple shouldn't own the App Store, Ek is seeking changes to Apple's conduct on the App Store. Right now, he says, apps like Spotify that don't pay a 30 percent commission to use Apple's in-app payment system are penalized in certain ways. They're prohibited, for instance, from emailing their own users directly or enabling them to upgrade to premium services inside the app. Ek isn't suggesting anything as radical as Apple giving up the App Store entirely. Instead, he's asking that all apps have control over which payment systems they use and have the ability to communicate with their users directly. He also asks for all apps to comply with the same rules---including Apple Music.

Ek's brand of antitrust argument may be more appealing to US regulators at the Federal Trade Commission and the Department of Justice who are wary of overly disruptive action, says Martin Gaynor, professor of economics at Carnegie Mellon University and former director of the FTC's Bureau of Economics. "There's a set of very, very strong policy recommendations Senator Warren has put out. Many of them, particularly breakups, I would describe as last resorts," Gaynor says. "Never use a sledgehammer when a pocket knife will do."