That's because it's not the original snail thread. It was an improvised snail thread, an IST. The other one is around somewhere.
*Bob pictures 20 years later... A skeleton of Bob, dust left from the food... Or no, Bob would have eaten that, so just a skeleton, and... amazing electronics or something that has withstood 20 years and still functions.... which would also need a modern day computer that will still function 20 years in the future, which is getting really doubtful... There are "stone DVDs" I heard about that are supposed to last for a long, long time, but you still need something to read them. Maybe they'll still have some technology to read whatever the forum materials are left in -- Unless the forum materials are printed out, or etched into stone. Then 20 years is easy.*