Other than Walmart and stores that have memberships like Costco, there aren’t really designated greeters. That being said, when I worked for a gas station, the area manager, the person over a couple dozen stores in our part of the state, mandated that we all give some sort of greeting to every customer that comes through the doors. This is because, as middle management, she had nothing better to do than read google reviews of every store and make sweeping mandates based upon them. Obviously, we ignored her and continued greeting almost nobody. So, there are some crotchety people that will complain about anything.