this cards will make you lose money. Almost 100% sure unless you live in a third world country where you can get kW at 0,06$. In that case you may get enough a month to drink a coffee.
This is insane. People are desperately poor, OMG.
The exit of money from one card 0.4-0.5 dollar. 15 bucks a month. Enough for a can of good coffee.)