But surely it's not about how far you throw it, but the force with which it is thrown...? The straps are pretty strong, so I'm struggling to see how a small child (or even some adults) could throw it sufficiently hard to physically snap the strap.
My 9 year old does karate, so has a pretty mean throw... it'll be interesting to see if he does break it when he's allowed to play with it, but frankly I don't anticipate any problems.
However, we'll always be wearing the strap when playing. I think they are necessary in case our son or anyone else does accidentally loosen their grip, because I don't want to have it bouncing off the wall - although it does look solidly built, I should add.