Hi guys, part of iubenda here. First, we know we have to work on driving a couple of points home.
There's a free, yearly or monthly subscription. The subscriptions really just divide a bigger chunk of money into smaller very affordable bits.
If you need the basic, free bit, perfect. Otherwise the SaaS system is in place for us to deliver a sophisticated service at very little up front cost. If you keep using it you get the updates pushed right to your app. The license can be reused on new projects, too.