items without properly determining if they are genuine. Mobile Star LLC settled with Apple for an undisclosed amount on April 27, 2017. In the following years, the selling of counterfeit products by Amazon has attracted widespread notice, with both purchases marked as being fulfilled by third parties and those shipped directly from Amazon warehouses being found to be counterfeit. This has included some products sold directly by Amazon itself and marked as "ships from and sold by Amazon.com". Counterfeit charging cables sold on Amazon as purported Apple products have been found to be a fire hazard. Such counterfeits have included a wide array of products, from big ticket items to every day items such as tweezers, gloves, and umbrellas. More recently, this has spread to Amazon's newer grocery services. Counterfeiting was reported to be especially a problem for artists and small businesses whose products were being rapidly copied for sale on the site. As a result of these issues, companies such as Birkenstocks and Nike have pulled their products from the website. One Amazon business practice that encourages counterfeiting is that, by default, seller accounts on Amazon are set to use "commingled inventory". With this practice, the goods that a seller sends to Amazon are mixed with those of the producer of the product and with those of all other sellers that supply what is supposed to be the same product. In June 2019, BuzzFeed reported that some products identified on the site as "Amazon's choice" were low quality, had a history of customer complaints, and exhibited evidence of product review manipulation. In August 2019, The Wall Street Journal reported that they had found more than 4,000 items for sale on Amazon's site that had been declared unsafe by federal agencies, had misleading labels or had been banned by federal regulators. In the wake of the WSJ investigation, three U.S. senators Richard Blumenthal, Ed Markey, and Bob Menendezsent an open letter to Jeff Bezos demanding him to take action about the selling of unsafe items on the site. The letter said that "Unquestionably, Amazon is falling short of its commitment to keeping safe those consumers who use its massive platform." The letter included several questions about the company's practices and gave Bezos a deadline to respond by September 29, 2019, saying "We call on you to immediately remove from the platform all the problematic products examined in the recent WSJ