Same way Square does. They know a large portion of payments are going to be made via credit cards because fewer people mail checks these days. They take their portion of the fees (which are the same as Square's). I guess they're banking on this being enough to support the service and keep everything running and make a decent profit. I guess we'll see. In the end, it wasn't as painful as I thought to move to a new service so if this one goes under I'll just use a different one. No big deal.

I haven't looked to see if they have any add-on features. I get the sense that they're attempting to expand to payroll and other stuff like Freshbooks did but I don't need any of that.