Where's the news?! Why do people continue to bang heads against the wall with this madness? Unless you're a thief, how is the craptocurrency thing better than my credit card that's insured from unauthorized use and gives me a cash back?! Yeah, you can't speculate with credit cards, and get rich quick, because $1 = $1 like forever, but isn't that what the real investment tools are for?
The only party benefitting from the cashback scheme is, of course, the middleman. By offering it, they give you an incentive to use the card more, which in turn gives the vendors more incentive to accept it. More card use equates directly to more money for them.
One of the hugely compelling benefits of cryptocurrencies is they entirely eliminate the necessity for such middlemen taking a cut and driving up costs for the parties actually partaking in the transaction.