Chinese fast fashion giant Shein has filed a lawsuit against its competitor Temu in Washington, D.C., accusing the latter of copyright infringement, design theft, and counterfeiting. Shein alleges that Temu, which is backed by Pinduoduo, has built an unlawful enterprise based on the theft of trade secrets and fraud, further claiming that its rival loses money on every sale. The lawsuit is part of an escalating legal battle between the two companies, both of which are prominent players in the cross-border e-commerce sector. Shein accuses Temu of intellectual property violations, highlighting ongoing tensions and competitive dynamics within the fast fashion industry.