Karygiannis was appointed to the Toronto licensing and standards committee – which deals with taxi regulations. He is a vocal opponent of Uber, Karygiannis is a lifelong personal friend of Co-Op Cab company CEO Peter Zahakos. Zahakos has made donations to Karygiannis, and is a lobbyist on taxi licensing issues. An examination by "The Globe and Mail" found that Karygiannis has received at least $7600 in campaign donations in 2014 from people connected to the taxi industry, about 10% of his total fundraising, and further found that Karygiannis had received donations from 12 individuals with the same last name and address, a house owned by an official with Diamond Taxi.