"I'm shopping like a billionaire," sings a voice in Temu's Super Bowl ad, echoing the online shopping app's tagline. With many of the e-commerce platform's best-selling goods priced under $10, it's easy to see why people are flocking to the app to purchase everything from clothes and accessories to home appliances. But some experts caution people to think critically about using it. "You probably get what you pay for," said Shreyas Sekar, an assistant professor of operations at the University of Toronto Scarborough and the Rotman School of Management. Temu — a Boston-based, Chinese-owned shopping app — first launched in...