Use of low-cost e-commerce giants Temu and Shein has slowed significantly in the key U.S. market amid President Donald Trump's tariffs on Chinese imports and the closure of the de minimis loophole, new data shows.Temu's U.S. daily active users (DAUs) dropped 52% in May versus March, before Trump's tariffs were announced, while those at rival Shein were down 25%, according to data shared with CNBC by market intelligence firm Sensor Tower.DAUs is a measure of the number of people who visit or inte...