Because the gloves are mostly pointless, if not making the problem worse. It's better to not touch your face and sanitize your hands. All the cashiers here don't use gloves. They sanitize their hands after every transaction, they wear face masks, plexiglass shield around their station, and there is a limited number of people allowed in the store, with a 1m physical distance between customers enforced. This is the requirement in South-Western Ontario. So far it's working fantastic over here. All decisions have been informed by scientists and experts in their fields.