More than half a dozen staffers at the New York City-based green tea chain Cha Cha Matcha — best known for its flashy, millennial pink branding and celebrity clientele, including many of the Kardashians — allege that the company’s co-founders have engaged in problematic company practices related to hiring, promotional giveaways, and the payment of their employees.

In dozens of Instagram comments and in separate interviews with Eater, former employees alleged that Cha Cha Matcha co-owners Conrad Sandelman and Matthew