Bolt founder and CEO Markus Villig speaks on stage at Web Summit 2021 in Lisbon, Portugal.Getty/Diarmuid GreeneThe CEO of European ride-hailing app Bolt is mandating workers return to the office 12 days a month.In a memo, Markus Villig called it a "disgrace" that fewer than half of staff went in more than 2 days a week.He said the policy will help Bolt "retain an intense culture" and "return to being a high-performance" company.The CEO of European mobility app Bolt didn't mince words earlier this month when calling workers back to the office.Bolt is an Uber competitor that offers services including ride-hailing, food and grocery delivery, and e-scooter rentals in its app.