As for the article, it mentions:
> It is normally recommended to use bubble wrap to protect SD cards in transit, but I have never seen bubble wrap inside a normal envelope which made me suspect that this would elevate the rate of delivery failure.
Bubble wrap envelopes exist, obviously. The envelopes are a bit larger but would work. When I order small items from Ali, this is often the packaging they used.
I would have been happy with 8 GB!
That is why there aren't genuine smaller cards: there just isn't a large market for them because the parts availability means the smaller capacity cards wouldn't work out any cheaper to source, so any noticeable drop in price would be through the seller reducing their markup. For the same price, people will buy the larger ones for the same price just-in-case they need more space later because why not? Even if there is a small price difference, if 8Gb or less is pennies cheaper than 16Gb or more, people will generally go for the larger option.
So to “why sell counterfeits?”: the scammy sellers can't sell them honestly in enough quantity to be worth bothering, so they lie.