Sure, but being mostly secure by default isn’t one of them. One advantage of running a service that offers optional subscription services is that they can offer security features like built-in SSL and AAA that just work. Any average user can install it and have a reasonably secure service running. Hell, until a few months ago you didn’t even need to open a port to have remote access to your content, whether you paid or not. Now they’ve made that a paid feature though.