"a Bloomberg reporter asked a Goldman executive if a partner at the bank had recently left the firm — noting casually that he hadn’t logged into his Bloomberg terminal in some time"
This is basically access to analytics. From a now-missing huffpo piece: "reporters were able to access a few different kinds of data that are not available to other terminal users. These included the ability to see how often customers had logged onto terminals and the ability to track some of their activities. They could see how many times in a month a client had entered specific commands on a terminal to, for example, look at information about foreign currencies or pull up economic indicators."
And why: "With these tools, Bloomberg reporters could keep loose tabs on terminal users, which include government officials and high-profile investors and traders. Though the tools were limited, they were potentially useful enough to give reporters leads to news scoops — the ultimate goal at an organization that prides itself on its news-breaking abilities."