I guess I don't understand.
First of all these kinds of transactions need a vehicle like bitcoin, because using cash introduces a lot of middle men that dramatically decrease the efficiency of illegal transactions.
Second of all there is no way to send money right now for legal transactions without also introducing a bunch of similar middle men. I think square cash is maybe free right now in a promotional sort of way but it will not continue to be free.
Third there is no good way to do micro transactions right now...also because of middle men.
This seems like a disruptive technology that will displace a lot of middle men....
As long as it doesn't get hacked it at least seems like a pretty great idea.