Something I've said regarding UBI is that it only works positively and sustainable when the resources spent on UBI is like the free water and washroom in a restaurant. I see no problem in taking 5% of GDP and distributing it equally among very single citizen (who are taxed under a flat tax). This could actually boost the well being of the humankind like the free stuff in a restaurant offers convenience to the customer creating more long term business for the restaurant.

I some countries with a budget surplus citizens get a free check at the end of the year (nothing huge. It's something like a $1000) This is what UBI needs to be. Whenever you start using UBI to eliminate poverty, it will spiral into destroying the nation itself.

UBI should not be an alternative to a job but a helping hand to follow the passions you love knowing that at least you won't go to bed with an empty stomach.