Just a slight correction, it's debit cards that are common in France and not credit cards. But yes indeed, at least in Paris, a lot of people buy everything with debit card (you can buy as low as 1€ by debit card in big chains).
We're spending money that hasn't been earned yet, and there is a lot of space to disrupt that as the industry is held by legacy companies who give out credit.
To an extent, overdraft is a thing on debit cards.
> We're spending money that hasn't been earned yet, and there is a lot of space to disrupt that as the industry is held by legacy companies who give out credit.
But Square isn't in that business, they're in the business of ferrying money between the consumer and the provider of goods and services.