A few years ago I noticed an annoyance with a soundbar I had. After allowing it onto my WiFi network so we could stream music to it, it still broadcast the setup WiFi network.

While dorking around one day, I ran a port scan on my network and the soundbar reported port 22 (ssh) was open. I was able to log in as root and no password.
After a moment of “huh, that’s terrible security.” I connected to the (publicly open) setup network, ssh’d in, and copied the wpa_supplicant.conf file from the device to verify it had my WiFi info available to anyone with at least my mediocre skill level. I then factory reset the device, never to entrust it with any credentials again.