There is an expectation of privacy when using the bathroom though. There isn't when using a company issued computer, your employeer controls all the software on it, controls the network traffic - why would anyone have an expectation that what they use it for remains private? It's like there's no expectation of privacy when using an industrial lathe - it's meant for a specific purpose, if you use it for private purposes while at work, you shouldn't be expecting that to remain hidden from your employeer.