[vram22]

None of those "tricking other people" problems you mention have anything to do with UBI, per se. They are all about human nature, both the trickers and the tricked. That is not going to change just because of UBI being enacted / implemented. The potential solutions lie deeper down the stack (of turtles).

"There's a sucker born every minute."

https://www.google.co.in/search?q=quote+there%27s+a+sucker+b...

Barnum may not have said it, but it holds true even today ... probably every millisecond, if you take the ratio of the world's population to the number of suckers/suckees/suckincidents ...