To get paid. Universal income doesn't negate the value of making money. The Ontario UBI pilot used $17,000 per year as the baseline, I believe. Full time minimum wage hours at the time would have netted about $5k more per year (a little over $400 more per month). Not everyone hates these jobs if they aren't treated like shit. Lots of people like making more money over making less money.
Work 40 hr/wk for an additional $5k? $2.50/hr. I don't think most people would choose that route.
Yet you almost certainly know people who accepted a promotion at work that added no more to their income, and that implied a need to work more hours, or do more difficult work, or take on greater responsibility - or all three.
People, in general, are not lazy. They won't just sit around doing nothing, if they have any other options. Even if their basic needs are being met.
Shit, teenagers are reputed to be amongst the laziest cohort by age; Yet most of those living with their parents, with free food, shelter, and even many luxuries,
still get menial jobs, so that they can purchase luxury items that their parents can't or won't afford on their behalf; and so that they can have the pride that comes from having earned something by their own efforts.
This absurd hypothesis, that if people's survival isn't threatened by a lack of employment, they won't work, is as logically and observably nonsensical as the hypothesis that if people lack belief in God, they will immediately become rapists, murderers, and thieves.
The vast majority of people are not the lazy scumbags you assume them to be.
