Why is it forbidden to shine shoes?

Good evening everyone, because public places are civilized. Usually, there are many people gathered there. It is uncivilized to shine shoes there. Shoe-shining should go to the place where shoes are shined, and to the place where shoes are shined professionally. Shoe-shining should not be carried out in public, because there are many bacteria on shoes, which are caused by shoe-shining in public. Harmful substances are bad for people's health and air.