The Chinese-based platform Temu is transforming e-commerce, and it’s recently surged in popularity in the U.S. Described as being “like Amazon on steroids,” Temu’s products are often cheap and unbranded — but those low prices could be coming at high costs. Also on the program: few visible cracks in the labor market, a lack of remote work training, and an obituary for General Electric as a corporate conglomerate.