Why Your Marketing Attribution Breaks Without Cross-Device Tracking

Episode notes

In Episode 29 of The Marketing Operator Podcast, Lucas and Luna tackle a problem that quietly undermines most attribution models: cross-device identification. When the same user browses a product on mobile, clicks an ad on desktop, and converts on a tablet, most systems count two or three separate journeys. Lucas walks through new research showing that up to 40 percent of conversions in B2C e-commerce are actually continuations of a session that started on another device. He explains why probabilistic matching has a 20 to 30 percent error rate, why deterministic login-based tracking still misses a huge portion of traffic, and how Google's Privacy Sandbox and Apple's App Tracking Transparency have made the problem worse since 2024. Luna pushes back on whether marketers should even care if attribution is imperfect, and Lucas argues that inaccurate attribution leads to misallocated budget, wasted ad spend, and the wrong optimization decisions. They close with a practical takeaway: run a cross-device audit comparing your CRM-based attribution against a third-party measurement service for one campaign, and the gap will tell you what you're blind to.