Lovable is valued at $6.6B and just made it possible to launch a paid product in one conversation. That sounds like a feature announcement. It's actually a platform strategy. Every vibe coding tool can generate a landing page. Replit, Bolt, Cursor, V0. The output looks roughly the same. Switching costs between them are near zero. You can copy-paste your code and leave tomorrow. The moment payments start flowing through your app, that changes. Now your revenue depends on the platform. Your…