Similar to how software companies release free software to augment what makes them money, Bloomberg is able to spend a lot of money on producing content that is sponsored by their terminal subscriptions.
The WSJ might be in a unique situation where their primary audience will pay, often due to companies footing the bill for employee's, so perhaps they can be one of the few news producing companies that doesn't have to depend on Google for traffic in that their primary audience loads up their front page multiple times a day just to see what's there.
I wouldn't be surprised if they did a deal with Bloomberg to provide their content on terminals to further strengthen their ties to their core audience.