I think this would be much closer to Google investing in Mozilla (pre-chrome). My understanding is that Visa makes most of their money on credit card processin

I think this would be much closer to Google investing in Mozilla (pre-chrome). My understanding is that Visa makes most of their money on credit card processing fees. Square is extra infrastructure that strengthens the use of credit cards. Particularly in a market that was mostly untouched before. Low end mobile payments where limited to cash before. With Square visa is part of the game.