Given the tremendous inflation occurring because of non-universal benefits, UBI pretty well died as a subject. Everything the anti-UBI people have said would happen, is happening. So if it were universal, it would be worse than this.
Trying to discuss UBI is complex because every single attempt at it has failed.
There is a simplistic idea of UBI = $1000/month to every single person. Just start delivering cheques and see what happens? Everyone earns $1000 more and everyone bumps up in the progressive tax and hopefully you tax enough to keep the budget balanced and inflation under control? We know this doesn't work now. MMT is dead as a subject. We must do much more than just free money.
Lets look deeper.
What if we dismantle every single safety net. Welfare goes away, employment insurance, child benefits, old age pensions, indigenous UBI, etc. These all go away. We take those budgets and combine them and disperse equally. In essence what happens is that from a government budget point of view we aren't broke. At exactly the same time we also make a constitutional amendment requiring the government to balance the budget.
What is this exactly? It's a negative income tax that Milton Friedman recommended ages ago.. https://www.youtube.com/watch?v=xtpgkX588nM