I remember years ago someone scanned the Internet IPv4 space for open unpassworded VNC servers. Many of them looked disturbingly like industrial control systems.

Just take a look at https://infosec.exchange/@shodansafari. A lot still look like that.

Even the water control system for a big French Dam:

"115 batshit stupid things you can put on the internet in as fast as I can go by Dan Tentler" - https://youtu.be/hMtu7vV_HmY