OpenAI CEO Sam Altman. Kim Kyung-Hoon/Reuters OpenAI has doubled its ads per user for ChatGPT mobile users in the US, a Sensor Tower report says. Big brands like Home Depot and Intuit displaced smaller software firms as top ad buyers. Hundreds more advertisers are gaining access to ChatGPT to bid for users' attention. OpenAI is getting a lot less shy about putting ads into ChatGPT. If you use the ChatGPT mobile app, you may have already noticed. According to newly released US data from the ...