The entire file server and all its features are compressed into one Python file. Drop the file into the root directory of the drive you want to use, and run it to start the server. That's it.
You can run it almost anywhere, including Linux, macOS, Windows, Android, and even Raspberry Pi. You can choose to run it with or without Docker, and the whole setup is incredibly portable. Yes, you can build your own Raspberry Pi cloud server with Nextcloud, but it won't get nearly the performance you would with Copyparty.
The simplicity also extends to what Copyparty actually does. It's a web-based file server where you can upload, download, share, and store files for as long as you need. No extra email clients, calendar apps, or fancy collaborative editing features. Just a simple file server that lets you manage your files with ease.