Google: Our products work for most people. If they don't work for you, we won't support you. Good luck with our competitors.
Paypal, Square: our fraud prevention metrics are generally reliable. If you're a false positive, we won't serve you. Good luck getting your money.
Comcast, Time Warner Cable, etc: Our Internet services work pretty well for most people. If they don't work for you, enjoy spending an hour or more in customer support hell. They may solve your problem. If not, good luck getting home internet from our non-existent competitors.
Imagine if the rest of the world worked like this:
* People whose legs work can use the toilets here. In a wheelchair? Good luck finding somewhere else.
* Only people who can drive a car can get state-issued ID. Can't drive? Good luck not officially existing in the eyes of many.
* Only people without a history of chronic illness can get free health care. Pre-existing condition? Good luck with your third job to pay for your treatments.
It is absolutely Square's prerogative to determine who they will and will not serve. And if you choose not to serve someone because they are an inconvenient minority, it's your call. And it makes you kind of a jerk. Expect to be called out on it.
Square: you are PayPal. You are Comcast. You are the old and busted status quo that the new hotness will usurp one day. Don't like it? Prove it otherwise.