This creates an issue where jobs that pay only slightly more than $1k a month end up not being worth it. For example, someone working 30 hours a week at $10 an

This creates an issue where jobs that pay only slightly more than $1k a month end up not being worth it. For example, someone working 30 hours a week at $10 an hour would see their income only go up ~$200. You could phase it, but that only weakens and does not remove the underlying issue and there are already existing cases where multiple problems with phasing stack, ending up in the same problem. Going with a simpler form of UBI that gives everyone $1k no matter what completely eliminates the issue (well, there is a minor issue given that money have a diminishing returns in value, but the impact of this is so far weaker than the issue of cut offs or phasing out benefits).