OpenAI turned a rate limiter into the best growth loop in AI. Codex went from 3M users in April to 20M this week, adding 5M in the last 9 days alone, and the engine is a reset button one guy presses from his desk. The loop is simple. Usage limits create scarcity, and scarcity makes a reset feel like a gift instead of a refund. Tibo has posted the word "reset" nearly 100 times since November, at unpredictable hours, for unpredictable reasons. Hit 5M users, reset. Bug report, reset. Bug fixed,…