I primarily use a strap and a kinetic strap. I've broken a number of them over the years and seen a few more broken by others. In my experience there's two reasons for breaking a strap. Mine broke from age and wear and the others I've seen from lack of knowledge/misuse.
If my strap broke, it was because it was old and heavily used. This is my fault. In my youth, I broke tow straps trying to use them as kinetic straps. This was also my fault.
I couldn't ask for a replacement.
If the circumstance is where you must misuse something because its your only way, a heads up to the stuck guy is in order.
I have knotted broken straps back together. I carried one of those for a while. I was too cheap to replace it.