They can't just stop taking cards as they would lose a lot of customers. Most small places not declaring cash want to stay off the radar, they use tricks like

They can't just stop taking cards as they would lose a lot of customers. Most small places not declaring cash want to stay off the radar, they use tricks like using old cash resisters that don't have trackable invoice ids. Food places are rife with it as they can claim excess food was thrown out as spoiled.