It illustrates, if needed be, that handing meaningful amounts of money to all or most of the population in a recurring way is not sustainable.

The responses to the covid lockdowns, which are incredibly expensive, were only considered because they were one-offs and time-limited.

If payments are restricted to a minority, the poorest, then it boils down to what already exists in most European countries and the question is then "what's new?"

In general UBI proposals are ideological solutions to ideologically-constructed problems. They are not realistic nor practical and thus thin on practical considerations and hard numbers.