TikTok's Infinite Scroll: Why the EU Calls It Illegal

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Hello, dear subscriber.

On February 6, 2026, the European Commission issued a preliminary finding against TikTok. The charge is worded in an unusually clinical way: “addictive design” in violation of the EU’s Digital Services Act (DSA)¹. This ties directly back to an ADHD newsletter I wrote earlier.

This is the first time in EU history that an app’s algorithm and UX design—not its content—have become the direct target of legal sanction. This isn’t about what’s being posted. It’s about the structural architecture of the experience itself: infinite scroll, autoplay, and hyper-personalized recommendation algorithms.

But a question surfaces here. “YouTube Shorts and Instagram Reels work exactly the same way—so why TikTok specifically?” And beyond that: what ripple effects will this regulation have on AI personalization services as a whole?

The Day the Slot Machine Moved Into Our Phones

Infinite scroll first appeared in 2006. It was invented by Aza Raskin, Twitter’s former UX designer, who later publicly called it “one of the mistakes I’ve made.”

Why the regret? Because of a behaviorist principle B.F. Skinner discovered in the 1950s: variable ratio reinforcement. In experiments with rats, Skinner found that unpredictable rewards sustain behavior far more powerfully and for far longer than predictable ones. Slot machines are engineered around exactly this principle. Every pull feels like something might come out—but the uncertainty of when is what keeps your hand from stopping.

Scrolling down a social media feed is structurally identical to pulling a slot machine lever. When you find something interesting, dopamine gets released, and you start anticipating the next hit. Even when that anticipation goes unmet, your finger is already moving.

Here’s where TikTok’s distinction emerges. YouTube Shorts and Instagram Reels technically hit a point where content runs dry. TikTok, by contrast, reconstructs its playlist endlessly in real time, learning from user reactions as they happen. There’s always a “next video” waiting in the wings. The European Commission described this design as switching the user’s brain into “autopilot mode.”