The specific unsafe condition I am worried about is that the power management electronics lack any sort of fault protection, and this ends up causing a shock, b

The specific unsafe condition I am worried about is that the power management electronics lack any sort of fault protection, and this ends up causing a shock, burn, or fire. I have a hard time imagining a situation where a wearable with a USB charging port is designed so cheaply that it only works with specific USB chargers, but still includes over-temp, over-volt, over-current, etc. protection. Needless to say, there is not even a suggestion of this thing being either UL or USB-IF certified.