Some Canadians do get great benefit from Canada quasi-UBI. My family was able to afford a four-day vacation.
And low income Canadians, like myself, pay very little taxes. We are not taxed until we earn $19,000 a year. The rate is 25% over that amount. So at $19,000, I pay $0. At $29,000, I pay $2500. At $99,000, I would pay $20,000. The working poor in Canada do not fund the taxation coffers very much.
The "legit reasons for not working" have merit. But trying to figure who is legit or not has proven to be fraught with mistakes. A UBI gets rid of legislation and civil servants deciding who gets the stipend or not; i.e. everyone gets it.
For those who have addictions or mental health issues----and not dealing with them--- we could say to them: "We have given you enough money to survive---and somehow you are not surviving." While we should have social programs to help them through their ailments, most of the responsibilty lies on them. I kind of use the gambler using his UBI to gamble and then lives on the street. I would say society has exonerated itself from this man's problems.