I don’t get it. What’s the spirit of ubuntu? Is the underlying OS based on ubuntu instead of fedora?

What’s the actual difference to fedora silverblue?

Half the answer to “why did you make your own linux?” is that it’s awesome being able to revert back to the original fedora OS.

Because it follows a cloud-native approach, the end user has the flexibility to rebase back to the stock Fedora or any Universal Blue image. It’s more like having someone install, configure, and maintain a polished Fedora setup for you.