There's no fee to install apps on your device, it's the developer that gets charged, not the user.
E.G. if you're a company, you can rent a printer and pay per page. THe printer is physically in your own office, it's for your own exclusive use, but you can still get a per-page contract if you wish.
> Join the Apple Developer Program to reach customers around the world on the App Store for all Apple platforms. Membership provides the tools, resources, and support you need to develop and distribute apps and games, including access to app services, testing tools, app analytics, and more.
List of tools that this subscription supposedly covers:
.......you do understand there is no difference, right? Any extra costs incurred by the developer will be passed on to the user.