I think the concept is unlikely to be effective due to human nature and the way markets work. However, I think it would be a big improvement if it replaced our current welfare system and minimum wage.
Our current system encourages all the wrong things. UBI would at least be fair if it was NOT means tested and was equally given to every CITIZEN.
But I believe it would have similar drawbacks as the current system: people who prefer to use drugs, not work, and resort to crime to get more than the handouts they have received.
Advances in robotics and automation appear to be headed toward putting a very large number of people permanently out of work. Like it or not, something along the lines of UBI would seem to be coming as a result, imho.
Will people misuse their income? Of course, there are people who are irresponsible.
Our welfare system discourages productivity and encourages dependence.
If you work, you lose your benefits.
UBI works the opposite way, if you work and earn more you keep what you’ve got and can build a better life.
It has much to commend it.