How do food stores that let you bring your reusable containers manage it? See detail.

Edited to add:
I’m not referring to
the kind of items here: https://www.bbc.com/news/business-48498346 I’m referring to the deli section for example. Is there a video that shows the process? Added: The anti side says the cutlery could touch the container and who knows how clean sterile the containers are..