Comment The word JUST makes the answer NO (Score 1) 59
Selling ads isn't even the primary reason the tech companies are inserting an AI into every human interaction they can.
Selling ads is how they are gaining the money and data to compete in the largest arms race in history.
The winner of that arms race will be the first to develop faster, better working, and more energy efficient models of the processes of human thinking and interactions at scales from the most intelligent and creative individuals to the most effective national policy producing groups.
Reverse engineering is examining the inputs and outputs of an unknown process to develop a working model of that process. AI prompts are the output of that process. AI responses are the input.