Privately held OpenAI has hired its first chief marketing officer, luring Kate Rouch away from cryptocurrency exchange Coinbase Global (COIN).The hiring of Rouch comes as OpenAI says that it is considering adding advertisements to its artificial intelligence (A.I.) chatbots to drive revenue growth. Rouch had worked at Coinbase since 2021, where she led global marketing and public relations at the crypto exchange.Rouch also spent 11 years at Meta Platforms (META), where she was global head of brand and product marketing for Instagram and Facebook. She takes on an entirely new role at OpenAI as…