Koby Conrad said that San Francisco was "really good for early-career humans." Caroline Tran/Selina Pan Photography Koby Conrad moved from San Francisco to Buenos Aires to build a family. "I love the food, I love the culture, and I love the fact that my rent is 10x cheaper," he told Business Insider. Conrad founded Sunflower, an AI sobriety companion. He said that he's more "locked in" in Buenos Aires. This as-told-to essay is based on a conversation with Koby Conrad, the 32-year-old founder…