I have personally spoken with 3 business owners who have work, would like to hire back their old workers, but those workers won’t come back because they would lose money by working.

Regarding the study you quoted, the authors note: “ One should be cautious with a causal interpretation, however, because we also find evidence that those collecting UI benefits may differ from those who do not collect benefits along unobservable dimensions. Specifically, those who receive UI benefits tend to have had higher-paying jobs than those who never apply for benefits, suggesting that they may be higher-skilled workers, on average.”

[Edit - my concern with UBI is that if a majority can continually vote for a rise in the UBI, by increasingly taxing a rich minority, eventually those tax levels will get to the point where less is produced. Even if people choose not to work if it pays more than working (my belief based on limited local experience - I certainly wouldn’t go to work if it paid less than staying at home!), it’s not relevant to UBI which is unchanged whether you work or not]