The goal could still be to get as many Square POS systems onto the market so that a competitor (ie. Amazon) can't just waltz in and start expanding aggressively.
Amazon, Google, etc. can afford to give away POS systems for longer than Square can stay solvent.
Square's POS is also free
Does Square have the margins Apple or Google have that would allow them to give them away for free forever while not making a profit?
Square Cash, Square Capital, Square Market, Square Stand, Square Register, Square Reader. Add the recent Caviar acquisition to the spaghetti on the wall.
None of those solve the "somehow contrive to lose piles of money at being a financial intermediary" problem.
In fact piling on more products that lose money accelerates that plan!