I think my biggest problem with these tests (not the idea of UBI) is that they go entirely based on what the recipients say. There's not really any indication that fact checking is done to confirm they actually are living somewhere now, or they did get their cars fixed, etc.
I'm confident that the money helped, because obviously it would, but I wish we could get some actual solid data on how much it helped. The cynic in me believes that desperate people getting 1000$/mo will embellish how much it helps in order to keep getting the money, when in reality they need 1500$ or 2000$ to afford housing in Denver.
Years ago, I lived in an apt.
A week before moving out, a friend spills their drink on the carpet.
I get some quality carpet cleaner to clean the stain, and the spot is now noticeably much cleaner than the rest of the carpet. Not bleached, actually clean looking.
The apt keeps my deposit and says we ruined the carpet and it needs to be replaced. Non negotiable.