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These are mostly a myth to my understanding.
There is some theory on how the chromium in stainless steel could help with breaking down and removing the smelly compounds from onions and garlic off your hands, but there aren't any studies proving this.
In my experience just properly washing your hands with water for 15-20s works just as well. I think the "soap" kinda works because it tricks people to not just rinse their hands.
It's true, I've never used one of these and was absolutely lying about their effectiveness.
You're saying that as if I've never used one. I have, and I don't see a difference to just washing my hands with water. But to each their own ¯\_(ツ)_/¯
Regarding your jib. I like the cut.
Your understanding is incorrect.
Stainless steel is an alloy composed mainly of iron, with added elements like chromium and nickel. The smooth, inert surface of stainless steel can attract and bind sulfur compounds from your skin. When you rub your hands against stainless steel, the sulfur compounds transfer from your skin to the steel, effectively reducing their concentration on your hands.
Water plays a crucial role in this process. As you rinse your hands and rub them against stainless steel, the surface acts as a catalyst for redox reactions. Sulfur compounds on your skin are chemically altered, potentially breaking them down into less odorous forms.