Like others have said, it's just an attempt to make selfhosting some things prettier and more user friendly while also giving you a system you could daily drive.
Honestly if you're even a little bit familiar with Linux, I would say just install Proxmox instead. It's such a good tool that will make experimenting and learning so much easier. If you still need docker then install portainer in an LXC or VM and off you go
What if that content isn't there tomorrow?