Customer zero in this channel's material is Guillermo Rauch's operating principle at Vercel — “we're always customer zero.” It means dog-fooding your own tools: be the first, most demanding user of the technology you build, and extract shared infrastructure from that real usage rather than from hype.[^3ba531af-f9b4-5c19-a48d-e40e316704b2@217] Concretely, the channel ties the idea to products before frameworks: the AI SDK (now a leading JavaScript framework for working with AI models) didn't come from chasing AI hype — it came from Vercel building real AI products like v0 and then extracting the shared infrastructure they had built for themselves. The model is React and Meta: people saw a great product and asked “how did they build that?” — so great products are their own best marketing, and the framework follows the product.[^3ba531af-f9b4-5c19-a48d-e40e316704b2@217] In the broader Building AI Products and Startups material, customer zero pairs with riding early, messy technology waves: spot the few drops before the wave, ship an opinionated solution for your own needs, and let a great product do the marketing before a framework ever exists.