Tech companies are pouring trillions into artificial intelligence , but investors shouldn't assume the bets will pay off, Jim Zelter, president of Apollo Global Management, said. "We've seen this many times in our last 30 years, whether it's cell phones or other technology uses. There's no doubt they're going to have a massive utility," Zelter said on Goldman Sachs' "Exchanges" podcast published on Thursday. "But is the economic owner going to harvest the right returns for that investment?" he