YouTube Mass Unsubscribe: My Brother Vibe Coded It in Class 11, I Refined It for Production

My brother is 17 and in Class 11. He doesn't know what a REST endpoint is. He's never opened DevTools on purpose. Last month he built a Chrome extension that unsubscribes you from YouTube channels in bulk, and it worked. And it worked. It actually worked. He wanted to nuke his entire subscription list. 300+ channels accumulated over years of binge-watching gaming walkthroughs, tech reviews, and random stuff the algorithm tricked him into subscribing to at 2am. His feed had become completely unusable. Every time he opened YouTube, it was wall-to-wall content from channels he didn't even remember subscribing to. YouTube's solution? Click a channel. Click unsubscribe. Confirm. Go back. Scroll. Repeat. For 300 channels, that's close to a thousand clicks and an hour of mind-numbing repetition. He wasn't going to do that. So he decided to build something instead. He opened Claude Code, described what he wanted in plain English, and started prompting his way through a Chrome extension from sc