Why is it not allowed to climb with paracord rope?

Climbing ropes have a special release.

Criteria are among others

• Rope diameter – typically 6-11mm, sometimes also just under or just over it. The particularly thin ones are generally semi- or twin ropes which are used in the pair and slide slightly stronger through the safety device, ropes with release as single rope are used individually, are thicker, the particularly favorable specimens are very thick (because here the loadability is achieved by thickness and non-cost material and special processing) and slide in the rope to pick up/out somewhat heavier through the safety device. But everything in a safe area.
• Categorization: As already mentioned, there are single ropes, half ropes and twin ropes. Simple ropes are common in sport climbing, half and twin ropes in alpine climbing and ice climbing (if a rope breaks down, you have to break off the route and rope it off, but they still offer enough protection. Twin ropes can only be used in the pair, both forerunners and forerunners. With a half rope, the forerunner has to go with two ropes and can theoretically also secure a forerunner at each end.
• Break load: Here it becomes exciting. 12kN is given. These are stupid converts 1200kg. Why so much? Because here (and therefore the indication in kN also makes more sense) the acceleration or delay in a fall is included. A climber with 80kg (the average weight for the standardization of herangeocene) weighs when it crashes, for a short time several tons, so it also tears up the fuse partner a bit. The gravitation is now 9.81m/s2, i.e. (we leave air resistance away) a climber falls after 1 second with 9.81m/s, after two meters with 19.62m/s, … and when arriving abruptly in the rope, that means that the fallen seconds are the factor for the weight to be braked (grob weight climber*case duration) and in a forehead you sail a few seconds before.
• Cable expansion: In order that the stop is not too abrupt, the rope has to stretch (dynamic rope). But that should not be too gum-like, we are still climbing and not bungee jumping.
• Standard door: The number of standard doors (which are already relatively heavy) must be completed in the test sample without breaking
• And some more.

This also makes sense somewhere, the rope should not tear and the fall should be as soft as possible (stitch word dynamic rope).

If you now see other applications, such as in your comment on another answer parachute cables: I don’t know about parachutes now, but I assume that static ropes are used here, that is, those that hardly stretch. In addition, many ropes on the parachute and the way it opens are softer than a fall when climbing, so that less breaking load is necessary. I can imagine that the ropes must be lighter and thinner.