And probably is. Looks like an off-the-shelf industrial arm from the video. The common recommendation around these powerful automated machines is to stay clear

And probably is. Looks like an off-the-shelf industrial arm from the video. The common recommendation around these powerful automated machines is to stay clear over the entire range of motion. These are difficult to secure even if they have force-sensing features, for the simple fact that it's incredibly difficult to foresee all possible ways you might need these sensors, and the sensing capability might be skewed toward higher forces. As others mentioned, this arm might stop by default if bumped, but maybe during the downward motion a sudden spike in pressure is expected to be seen to complete the step. Not taking sides here, just trying to explain that the entire concept of "fail safe" is _extremely_ hard to achieve even with apparently dumb moving machinery. A better solution if people are involved is to design a robot that can always be overpowered. But such structurally weak arm might be quite tricky to move, and probably start oscillating like jello without proper dampening and motion control. Not something I would expect to find or be able to purchase due to the lack of practical utility (besides playing chess I guess).