The inevitable has arrived. Ads have begun popping up on ChatGPT—even, reportedly, in initial responses to user queries, rather than after extended conversations—and some fans aren’t pleased. “RIP ChatGPT,” wrote one Reddit commenter. “It was fun while it lasted! 💔” The ads, which are being rolled out to free users and those who pay for the lowest-tier subscription ($8 per month), are rather familiar and banal in their presentation: a “sponsored” box pitching a product that ChatGPT’s algorithm...