With containers, most will have a persistent volume that is mapped to the host filesystem. This is where your config data is. When you update a container, just the image is updated(pihole binaries) but it leaves the config files there. Things like your block lists and custom dns settings, theme settings, all of that will remain.

Exactly right. If the article says “home owner shoots armed robber attempting to kidnap children” you’d have people losing their minds about guns and violence. Also people would be upset that the person owned a home…