New Delhi, Sept. 14 -- If you are familiar with Mumbai, you will know that Juhu Circle in the western suburbs is ring-fenced with traffic, construction, and tonnes of billboards. Most are unbearably bright at night and beam ads for real estate projects, fancy cars, and the latest shows on the top OTT platforms.

So, it was surprising to see this week a discreet-looking analogue ad for ChatGPT, the app probably most synonymous with all the wonders of generative AI, sitting on one billboard in the corner next to Juhu Circle bus stand. This ad campaign, and others spotted on the billboards in Chennai, Jaipur, Delhi (National Capital Region), and Bengaluru, isn't flashy or 'big bang'. But it effectively reminds customers what the app is all a...