Link to Original Source
A few months ago I ran a Tor relay node with no exits for anonymized web traffic. Apparently as a result of being on the Tor directory listing, Slashdot admins decided to ban my home IP from being able to login. Because my cookie has been valid since then, I didn't notice until a few weeks ago when it got wiped. I'm now banned from my primary IP address, so when my cookie expires I am no longer able to login.
Most public domain software is free, at least at first glance.