An old dirty trick to sabotage a aluminum boat hull used to be to flip a copper penny into the bilge. Water and galvanic corrosion can produce a penny-sized hole in a shockingly short amount of time.
Interesting -- I hadn't heard that one. I assume it's a salt-water reaction?
I would suggest that you might give these presumed low quality stainless items a shot in non-critical use to see how they hold up.
Agreed, these items still have value for casual use. I'm only paying a buck or so for them (used), so I have no major gripe. I just wanted people to be aware of an observed weakness.