By Eric J. Savitz Google is one of the best businesses ever built. The Alphabet unit controls more than 90% of the global internet search market, which allows the company to sell an astonishing amount of advertising, $238 billion worth in 2023 alone. But the market now fears it could all come unglued by a torrent of new competition from artificial intelligence. To be sure, it hasn’t happened yet. By one estimate, Google still accounts for 39% of the global ad market. Alphabet is the fifth-largest U.S.-listed company by market value, at $1.7 trillion, trailing only Microsoft, Apple, Nvidia, and Amazon.com. Long-term investors, meanwhile, have been more than rewarded. Had you invested $1,000 in Google shares at the August 2004 initial public offering, you’d have more than $55,000 today. But the Alphabet story is finally showing cracks. At a recent $138, shares are flat this year, trailing the 8% gain