In many ways, Venmo—the peer-to-peer payment app, now owned by Paypal—has revolutionized the way we sort out group meals, cab rides, rent and more. It’s virtually eliminated IOUs, the hassle of searching for ATMs and the possibility of accidentally shafting someone with an unfair portion of the bar tab. But according to Quartz, the ease of using Venmo has also brought out the worst in some people. In just one of many cases, a girl was charged for a glass of wine she drank at her friend’s home. It’s unexpectedly enabled stinginess in situations when treating would usually be the norm.