HN tends to punish people using Tor or other methods to obfuscate their tracks. On the four or five other accounts I've abandoned, this is then first that allows me more than 3 minutes on the site without invalidating my token due to inactivity. I suspect because it's been a valid IP every time (or so they think).
You should not expect privacy on computer systems you do not own. HN included.
"On computer systems" has a hollower ring now than it did a decade ago. Everything is on a computer system now. Even face to face interactions leave a plethora of metadata behind.
The nature of privacy has always been a function of social norms and technology, but given the directions we're headed in these days I think it's easy to make a case that the average citizen has given up a lot more privacy, then they have gained in convenience.
My life was easier when it took me an hour to download a megabyte and I spent more time outside... and I say that as a web developer.
You should not expect privacy on computer systems you do not own. HN included.