So this is just a question that popped into my mind the other day, sorry if it doesn’t fit the community.
At the local pharmacy I noticed two USB ports on the back of the monitors they were using and I was thinking I could’ve easily gotten a RAT in there if I was more smart and malicious.
Similar places were banks or shops, sometimes ethernet ports as well.
Realistically, how dangerous is this? Thanks for any answers.

It depends on the system. Some enterprise systems have a BIOS which will survive a loss of battery power and don’t have a hardware reset process. Some Dell laptops were like this and you needed to contact Dell to do a BIOS reset. It’s been long enough that I have forgotten how that worked, but I’d assume it’s some sort of public/private key signing setup.