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.

An exposed USB port is potential attack vector, but that could be mitigated in many ways. It could be through the OS via policies or other security measures, or it could be disconnected within the device itself, for example.