economist.com brilliantly bans you from accessing their site after you've clicked a few of their links. The text vanishes because they've sloppily hacked this limitation in client-side by checking a cookie after the page finishes loading. This leaves 99% of visitors thinking that the site is broken, so they leave without ever noticing the message about how they need to pay a ransom to unban themselves.
For sites like this, you can sometimes archive the URL to evade the ban.