Don't connect gear to the public internet without proper configuration. Don't leave it at the default settings. Very very old advice, perhaps worth discussing again? Do we really need to keep telling people about this? (Or is it limited to non-IPVM readers ;-)
https://nexusconsultancy.co.uk/blog/printer-part-flaming-botnet/
Feel free to check out shodan.io and look for your fav vendor's gear.
Yes, the amateurs, the uninformed, the trunkslammers - they're the problem ("not us") but one does get to deal with this...