Not so private networks
I have no idea what you get up to online and you know what, I don’t want to know. You know who does? Pretty much every government and corporation in the world.
This wasn’t supposed to be a paranoia-fuelled introduction and it isn’t. The hard facts are Google, Facebook, Twitter et al. openly do their utmost to track your online (and real world) movements to the nth degree. Turning to nation states, China openly monitors and restricts its own citizens to a drastic level (so imagine what it’s happy to do with you) and it’s well documented the Five+ Eyes intelligence alliance (USA, UK, Canada, Australia, New Zealand and other buddies) monitor each other’s citizens and then share the data back, so no pesky local laws manage to get in the way.