aliexpressnonsense

I have one of these (albeit from Braun, not AliExpress). The high-power pulsed laser does actually wear out eventually, so they're hardcoded to stop working after several hundred thousand flashes. Yeah, the hard cutoff is a bit of planned obsolescence, but I've been using mine regularly for 3.5 years and it hasn't run out yet.

Also, the skin chart is some accidental racism. These only work best if you have light skin and dark hair, so that the laser light is absorbed by the hair follicles, damaging them. If you have skin that's too dark, too much light will be absorbed by your skin and probably burn you. If your hair is too light-colored, not as much light will be absorbed by the follicles and it won't be as effective.