Fonts business today is like paid shareware was to software in the past: a fabulous middleman idea that in that time was the abusive form of business than later became obsolete when new disruptive ways came in. They use senseless, really high cost licenses, most of them inspired in the analog world that doesn't fit in the internet era. Right now people may pay, but they will not in the future. Probably, the first thing you will see from this services is making cheap all the stuff progressively until renting individually isn't profitable anymore. At the end they're all will be free and we will pay only the delivery.

These services are just a masquerade for the same senseless business model: being intermediate, suck a big part of the artists work and that's all.

Because apps can charge $1 per person, websites usually can't.