"We must decide whether Van Buren also violated the Computer Fraud and Abuse Act of 1986 (CFAA), which makes it illegal “to access a computer with authorization and to use such access to obtain or alter information in the computer that the accesser is not entitled so to obtain or alter.” He did not. This provision covers those who obtain information from particular areas in the computer—such as files, folders, or databases—to which their computer access does not extend. It does not cover those who, like Van Buren, have improper motives for obtaining information that is otherwise available to them"
Thomas, Alito and Roberts dissented, and I hate to say it, but I agree with them.
"The question here is straightforward: Would an ordinary reader of the English language understand Van Buren to have “exceed[ed] authorized access” to the database when he used it under circumstances that were expressly forbidden? In my view, the answer is yes. The necessary precondition that permitted him to obtain that data was absent."
That's Thomas dissenting.