Those experiments are worse than useless for predicting what would actually happen in a "true UBI" environment. I say "worse than useless" as opposed to just "useless" since they make people
think they have some insight into what a UBI world would look like, but they really don't.
Giving a small number of people an amount of money below what they'd need to actually survive, with them knowing perfectly well it won't last forever has effectively zero in common with UBI. Give an entire contained population of people enough money that they can have all their basic needs met just with that money, and guarantee them it will continue for the rest of their lives, and I'd bet quite a lot that the results would be drastically different.
Also, not a big deal since you also provided two reasonable links, but many people will see that you linked motherjones and likely discount your comment entirely. It's on the same tier as OANN and breitbart.