The Justice Department just announced a long-awaited, massive antitrust suit against Apple. Those antitrust suits — big but slow-moving — are the primary way the US is challenging big tech.

But across the Atlantic, the European Union has been hard at work enforcing what’s known as the Digital Markets Act, a sweeping regulation that went into effect earlier this month that’s aimed at leveling the playing field between big tech and smaller competitors. Apple, in particular, has been engaging in what we can only describe as “malicious compliance.”

Verge reporter Jon Porter, who’s been covering EU regulation for years, joined me on Decoder to break down which companies qualify as “gatekeepers,” what new rules they have to follow, and what this means for the future.