From the New York Post, of all places:
Goldman later learned that Bloomberg staffers could determine not only which of its employees had logged into Bloomberg’s proprietary terminals but how many times they had used particular functions, insiders said.
The matter raised serious concerns for the firm about how secure information exchanged through the terminals within the firm actually was – and if the privacy of their business strategy had been compromised.
Oops. Imagine if AWS or Salesforce did something like this? They won’t because it is a kiss-of-death type mistake if there are viable alternatives, but Bloomberg is too entrenched for this to damage them materially.