None.

What's being proposed here is free existence until someone decides that they've found a job that they like. That's why Marx, et. all said it the way that they did.

There has never in human history existed a society, government, or economic system built around the idea of "We'll cover all your life expenses so feel free to do as much or as little as you want!"

It cannot work unless we have literal Star Trek Replicator technology so that material things have no real cost or value.