It’s actually more of a UniversalBlue for RHEL. Silverblue is atomic and rpm-ostree based but doesn’t boot directly into container images.

although setup on Linux is weird

Works fine with Gluetun!

Do you want to have a single UI for multiple clients?

Just use Arch in a Distrobox on Fedora or openSUSE. That’s the best of both worlds.

too much spyware

That’s just capitalist propaganda. There is no spyware! That’s just innocent telemetry!