I've only ever seen three of those in my entire life, they're all locked in a cabinet behind me gathering dust. On the other hand I paid for something with Square just yesterday and as my card was being swiped the lady said "We're excited because we're suppose to get the new Chip reader from Square next week."

> PayPal is in this market as well:

This reminds me of Peter Thiel's thoughts on monopolies.

Square are in competition with every payment method of every kind. They are not in some tiny "niche" category of payment that will somehow remain invulnerable to competition from banks, Apple Pay, Android Pay, Stripe, etc. etc.

I don't see how they can possibly survive in the long-term.