Comment by Andrex

Spinning up an all-new ad network is pretty tough. I would think OpenAI would need to beat Meta/Google on basics like CPM in order for the network effects to make it desirable for ad vendors over Meta/Google. Ad budgets are fixed and zero-sum and vendors (in my head, I don't know) would prefer to spend their money on the best network giving the best results. I don't know if ads in LLM chats can get there.