I think there is a fundamental misunderstanding here.

A multiuser system is a system where multiple users are logged in at the same time and ussing the computer.

So a multi-user desktop Linux would be a computer where multiple people are logged in each with their own desktop session on the same machine.

That was the way unix was first used, a big computer somewhere with multiple client terminals connected to it all doing their own thing. This is the environment x11 came about as well.

Nowadays even if the computer is shared by multiple people each with their own account only one of them is using it at a time.

Putting Linux on dumpster-find computers is a hobby for some rich Americans. They'd be happy to hand those out to the poor and needy who, however, wouldn't be caught dead with one of those. Because, sporting the latest iPhone at all times is part of the reason they're poor. -- The world is a complicated place, man.

I even am a well-off American and i share one of my computers