Those aren't "either or" things. Usually services are exposed through libraries. And a library requires a service if it has a canonical or centralized storage o

Those aren't "either or" things. Usually services are exposed through libraries. And a library requires a service if it has a canonical or centralized storage or processing, which can't be done locally. Now, sure, we do stupid things as services, for sure. But people often do it to monetize the service, or control the users. And so that'll never change. I recall someone making an "async HTML5 AJAX blink service" as a joke for this trend.