Linux

It is an odd thing to disqualify it as well, since the Ostree stuff is not used by normal users on those distros, and at least on uBlue distros, they are even replacing the DE store witg their own that only offers flatland, essentially making it as simple as android to use.

There are still some kinks to work out to make it a true replacement to ChromeOS (if there's still a single app on the store that needs flatseal to get working or fix some visual glitch, or allow to view a certain directory, then it wouldn't be as smooth as ChromeOS), but it's getting pretty close to what the author wants.