OpenAI just got a second round $10B investment from Microsoft, so that goes a ways ... They are selling API access to GPT for other companies to use however they like, and Microsoft has integrated Copilot (also GPT-based, fine-tuned for code generation) into their dev tools, and MIcrosoft is also integrating OpenAI's LLM tech into Bing. While OpenAI are also selling access to ChatGPT to end users, I doubt that's going to really be a focus for them or major source of revenue.