Well, they started with a power supply with no rating on it
You use your imagination to guess what it is, and if you guessed wrong, your house will be on fire.
That sound like that One Plus One bait and switch deal. There will be an upgraded model, which is more expensive, and they only have 1000 of them for $3.65.
It will be $3.65, when they prove that they can deliver a substantial number of them.