For instance, rents are proportionally related to the income of the population. How can we prevent the extra cash flow from being translated into higher rent/housing prices? If I have that extra cash, I would certainly 'leverage' it to expand my real estate portfolio :)
That said, I don't object to UBI per se and I agree that the Fed's policy would lead to some undesirable consequences. But without addressing the problem systematically, UBI would go nowhere better, I am afraid.