With Linux you can have total privacy even from your ISP.
You can be completely anonymous and free from being spied on – at least with a specific version of Linux called Tails. To quote DistroWatch, “The Amnesic Incognito Live System (Tails) is a Debian-based live DVD/USB with the goal of providing complete Internet anonymity for the user.”
Tails Linux is a live distro that you place on a USB stick. It doesn’t matter whether you run Windows, a Mac or Linux system. You put Tails on the USB stick, reboot the computer and woolah! You have complete anonymity.
This is done through something I don’t understand called the Tor network. Anyway, it’s a way no one can know anything about what you’re doing on the Internet, if that’s important for you. Edward Snowden reportedly uses this to conceal what he does (did if you want to believe he still doesn’t do “it”).
You can also use it in a virtual machine, if you trust the virtual host.
I’m no expert at this stuff, but here it is.