A lot of interesting research is being made about UBI right now.
There are a ton of videos about it, and also good articles on mainstream media like Wired, The Guardian, New York Times and so on.
Experiments have been made in developed countries, and surely if it is a 1-world country where naturally the economy is so developed that it can afford people to do whatever they want - people there are highly conscious and won't just sit around.
I believe people are naturally inclined toward progress and self-development, and are going to discover what they like and grow eventually.
Another point is that with the rise of AI and machinery some people are going to lose their jobs and that the risk of poverty and falling consumption is high enough to be able to just give people money to live on
So UBI is good in my opinion. It's gonna really shift our perspectives on how we we deal with issues nowadays