The competition between online marketplaces is getting to be particularly ugly. eBay has sent a cease-and-desist letter alleging that Amazon has illegally tried to poach sellers for its marketplace. According to the accusation, about 50 Amazon sales agents sent 1,000-plus messages through eBay's system in a bid to sway sellers to its platform. The poaching allegedly violates California's Comprehensive Computer Data Access and Fraud Act. 

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