Having low scores posted for all coworkers to see was “very embarrassing,” said Steph Buja, who recently left her job as a server at a Chili’s in Massachusetts. But that’s not the only way customers — perhaps inadvertently — use the tablets to humiliate waitstaff. One diner at Buja’s Chili’s used Ziosk to comment, “our waitress has small boobs.”According to other servers working in Ziosk environments, this isn’t a rare occurrence.

“Customers who might discriminate against a certain class or group of workers can use the system to leave negative comments that would affect the workers,” said Cornell’s Ajunwa. She compared the restaurant system to student evaluations of professors, which determine the trajectory of their careers, and tend to be biased against women.

And Ziosk could be a roundabout way for employers to discriminate against employees. Employers are legally restricted from evaluating employees based gender, age, race, or appearance, according to Karen Levy, an assistant professor in the Department of Information Science at Cornell University — but nothing is stopping Ziosk users from doing that, even though those ratings can affect a worker’s pay or employment. “If you outsource that job to a consumer, you may be able to escape that,” she said.