2. Value is something to be produced by people, i.e. something that requires work to be done (even if by pumping oil, or setting up AI systems, or protecting oil from neighbouring tribe...)
3. Why those who do the work would just pay for free loaders? Why is it considered to be moral at all?
And why being a free loader (assuming you are capable of doing work) is not immoral from any position?
On the most general common sense level, regardless of your political views or economical system...
Now, I don't personally think UBI is a good idea, but I do think valuing people based on the whims of a free market is a terrible idea. Something better has to be proposed, or else the income gap will increase and the populist sentiment will further side with UBI. Your move, Voltaire.
Now, lacking any possibility to discharge debt was considered immoral in many religious and philosophical texts since antiquity. Similar arguments and reasons should apply to (im)morality of "undeserved" income.