Chun also ruled that two Amazon executives named as individual defendants — Neil Lindsay and Jamil Ghani — were so entwined with the Prime program that they will personally face liability if the jury sides with the FTC. A third, Russell Grandinetti, could also potentially face personal liability if the jury so decides.

Amazon says it's phasing out a perk that allowed members to share Prime shipping benefits outside of their home. In an update to Amazon's customer service directory, the company confirmed that it would replace its Prime Invitee Program in October.

A federal trial beginning in Amazon's hometown this week is set to examine whether the online retailing giant tricked customers into signing up for its Prime service and made it difficult to cancel.

How easy it is to cancel a Prime membership is at the heart of a trial between Amazon and the federal government.