wondering why,

the easiest way to tell is by their speed and if they are sharing all the wonderful small file sizes that turnout to be trojans/viruses/worms/spam, usually T1 and especially T3's and or higher and even modems. I only try to dl from my fellow cable users. if you browse a host and you size it riddled with generated trojans then you will know that is pobably a fake. a porn host is usually a good sign that it is fake.