Some people probably wouldn't work if all their basic needs were met.(No judgement, i'd definitely consider it myself) And some billionaires probably are hard workers(although that is definitely not why they're billionaires)
For the most part, people like to work. To feel like they're doing something, to be productive. This is within reason of course. The work should be something they enjoy, and no one likes being overworked.
I absolutely don't like working. But I like things. My basic needs are insufficient for me to be comfortable and happy.
I would choose to work so I could go to the movies, buy video games, eat and drink decadent things, pursue hobbies, travel, etc.
Enough food, enough shelter, enough mobility, and enough telecommunication ironically isn't enough for me.
I've been fortunate to never have been only scraping by. I don't believe many people would choose it and it absolutely baffles me that so many people believe that so many people would.