Hackers started probing cloud-computing company Railway on a Sunday night in mid-October, signing up for thousands of accounts. Within days, they made off with assets worth more than $1.1 million. Most of the loot didn’t come from cryptocurrency. This hack wasn’t about extortion or ransomware, either. It was a smash-and-grab theft of the artificial-intelligence era’s most valuable commodity: computing power. Railway is one of about a dozen AI developer platforms hit with a swarm of cyberattacks over the past month. Some have involved data theft, but in many cases, the hackers targeted online credentials called API keys that are then…

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