The California Fourth District Court of Appeals ruled that Amazon can be held liable for the damages created by a defective replacement laptop battery purchased from a third-party seller on its marketplace. The buyer, Angela Bolger, reportedly got third degree burns when the battery, from Amazon third-party seller Lenoge Technology, caught fire. Amazon has defended itself against such liability lawsuits so the appeals court decision is a major blow to its e-commerce business. The company currently faces several other liability suits.

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In an ongoing dispute over Apple’s 30 percent commissions in its App Store, Epic Games, maker of “Fortnite,” threw down the gauntlet by openly encouraging players to pay the company directly, rather than through Apple and Google’s app stores. But within hours of the announcement, Apple removed “Fortnite” from its App Store, noting Epic’s “express intent of violating App Store guidelines.” Google also pulled the game from its Play Store. Epic Games responded by suing the two tech giants in federal court, claiming antitrust violations. Read more

Qualcomm reached the end of a trying five-year period, battered by antitrust allegations, U.S.-China trade tensions, an activist shareholder and Broadcom’s hostile takeover attempt among other obstacles. This week, the U.S. Court of Appeals for the Ninth Circuit vacated a 2019 ruling by a federal judge that Qualcomm had overcharged phone makers for its patents and abused its monopoly position. Qualcomm chief executive Steve Mollenkopf is now predicting sales of between 175 million and 225 million 5G devices this year. Read more

After testing earlier this year, Twitter has introduced settings that allow users to control who can reply to tweets. Twitter is responding to widespread pressure to combat chronic hate speech, misogyny and harassment. Twitter director of product management Suzanne Xie wrote that, “we’ve seen people use these settings to have conversations that weren’t really possible before,” adding that, “starting today, everyone will be able to use these settings so unwanted replies don’t get in the way of meaningful conversations.” Read more

Microsoft is reentering the mobile phone market with the Surface Duo, a dual-screen Android device priced at $1,399 and up. According to Microsoft chief product officer Panos Panay, the company is accepting preorders for the phone that will ship on September 10. The phone will be sold on Microsoft’s website, and at AT&T and Best Buy. The Surface Duo’s screens completely unfold to act as a phone or a book to provide more space for apps. The Surface Duo may appear before Samsung’s Galaxy Z Fold 2, which currently has no official release date. Read more