Payments ranged from $50-$1,000/mo.

Since they're following a specific cohort, I wonder if that isn't just the baseline percentage of recently homeless people who can secure housing on their own in 6 months. It would help if they had a control group.

Edit:

https://denverite.com/2024/03/26/denver-commits-2m-to-the-basic-income-project/

It looks like the $50/month group is considered the control group. If you ignore the income from the program entirely, it doesn't seem unexpected that 20% of people could secure housing over a 6 month period. So it's not that $50/month tripled the housing rate, it's that 6 months is enough time for 20% of people to increase their income enough to lease an apartment.

If you consider the inverse of that. Even after 6 months, 70% of participants that did not receive substantial assistance were unable to get their own housing. Does that result still surprise you when framed that way?