Yeah, this is why first aid courses, at least in Europe, do not recommend non-medical people to use those.

You can lose a limb easily with them after tourniqet was used for two hours or more, with proper medical care limb can be saved up to 6 hours after tourniquet was used but most paramedics don't have required skills and drugs. After moving a person to a less dangerous place tourniquet shold be moved (as in place another one lower and closer to a wound and higher one slowly unwinded but not taken off). They are extremely good tool for gun shot and explosive wounds, but should be used only in extreme conditions where you can't get immediate medical help. Also placing on on a joint almost always leads to a limb loss. 🫠