For example, let's say I'm born into wealth, should I waste my life working for no reason? What's wrong with taking what is freely given? There is a large degree of self righteousness in what you've written
UBI is only freely given temporarily.
When all the farmers sit back and live on their UBI, where does anybody get food from? If only 1 or 2 farmers keep on farming because they enjoy it, the price of food will skyrocket. Your UBI check won't be enough to cover the cost. Besides, there won't be enough food to go around, anyway. Same with everything else.
Maybe you can eat the check your UBI is printed on. But more than likely, it will be electronic, until the banks and Internet fail because all the bankers and Internet people are living free on their UBI.
The only way UBI might succeed is if we have enough automation... robots to do everything for us. But the world isn't far enough along into robotics to even think of UBI.
Then, what do you think about UBI below the poverty line?