OpenAI made its Cannes Lions debut this week, with CRO Denise Dresser declaring the company is in the advertising business. Projecting $2.5 billion in ad revenue for 2026 and $100 billion by 2030, OpenAI is positioning ChatGPT as a direct rival to Google and Meta for brand budgets, just as it files confidentially for a 2027 IPO targeting a $1 trillion valuation.