Exactly. That is why you don't use it to hold yourself up.

You have the same problem with webbing. But, half of 4000 pounds is still a ton. Half it again, and a third time, and it is still 500 pounds, and if that won't keep you off the ground you've got a bigger problem. And that is for the weaker end of 1" webbing, you can get a LOT stronger if you go up in grade and width.