OpenAI’s ChatGPT is leading a major surge in spending on artificial intelligence apps and services on smartphones.The seminal chatbot has grossed $529 million since its release as a mobile app in May 2023, nearly four times the second-highest earner, according to a new report by Appfigures. The market researchers saw AI app spending nearly quadruple in 2024 over the prior year — to $1.4 billion — and accelerate in the final quarter of the year. The $2 billion market opportunity is driven by cons...