UBI is a good idea for government to use on us. I say this from a personal advantage.
Most folks out there will be reduced to poverty (or greater poverty, if they are in poverty, already) with UBI. But because I know how to create multiple persons that all have my name (not that other people can't do this), and since I know how to assign the SSN (Social Security Number) from my SS person to other of my persons so that they can use it as well, and since I know how to benefit off all my persons, and legally protect myself from government officials who think I am doing something illegal (which I am not), I know how to make way more money (or live without it) than the simple UBI amounts.
So, UBI is a good thing for me. It takes property (in the form of money) from the people, and funnels some of it to me.

Yeah, I'm sure there would be loads of fraud. That would take another whole government department to deal with. I wonder if your idea is anything similar to the movie Into the Wild. If I remember correctly, the guy burns all his document. Then later, for some reason he decides he needs some document. He comes to a homeless shelter in California and real quick they did him up some new documents just based on what he said. I wonder why illegal immigrants don't do that. Well, I guess some of them probably do, we just don't think they're illegal immigrants. Haha!