None of these include a mention of meaningful economic impact.

> Being perfect at verifying UBI eligibility would require a large government infrastructure, just like today, so you can't claim that the U part makes it super cheap to administer.

It's already in place regardless of UBI, so it doesn't add meaningful costs.

Of course it's never going to be perfect, absolutely nothing is. Why even mention that? What matters is the impact of it being imperfect.

Compare it to the impacts of tax evasion, or wage theft, and they'll be completely negligible.