Humans are social creatures and people of all strokes in the anti work movement wish to return to a less structured, communal version of labor and survival. Starting on the premise of "you're the last person in earth" is a non-starter. It's coming from the perspective of this toxic individualism that denies people's innate desire for community and connection to others.

I'm generalizing and opinions vary widely but I think this would be a fair summary. Most want to decouple labor from survival. It is inherently coercive to be denied food and shelter on the basis of being unwilling/unable to work. Most want to divide essential labor (farming, housing, transportation, sanitation, etc.) as evenly as possible among a given population to ensure everyone is fed, sheltered and healthy. I'd type more but I'm at work and don't have the time to go into further detail.

Here's more of the "why". As for how, I don't have a handy resource right this second but I'd be happy to talk more when I can. For further reading I'd recommend that you look into degrowth, solar punk, anti-work, anarchism/ libertarian socialism, mutual aid, UBI, and social ecology. They're all pieces of the puzzle