The zoo has a pi on the internet it has ssh open [intentionally] and does a couple of things.
People seem to be so far less tolerant when trying to hack it and as i secured it before making it a world wide target. compared with intel hardware. It does not use the mac address on the pi so behaves like a pc with a network card in.
Maybe as it is a lower spec that puts people off as the connection tear up and tear down may feel like forever from say Burkina Faso (my blog)
People do try but disconnect after getting bored.