This is an old post, but replying helps your message.
It was recently blocked at more than just banks. Most big businesses have blocked it. They have their own big list of blocked sites, kind of like the AdBlock lists people use on Firefox or other browsers.
I don't like ads, scams, malware, or BS, so I block the things that I see as risks.
Same with Big business - risk management. Also, Zero Hedge is more of a Blog type site - most blogs are blocked regardless.