UBI has a lot wrong with it, but I'll just start and end with a first principle: Taxation is theft and therefore, government and UBI are immoral.
I advocate for freedom and consent, especially as it pertains to economics. The income I earn through producing goods and services that I exchange voluntarily with other individuals should be mine to keep; all of it. Anything less is not freedom and certainly not consent.
Taxation drives the economy. By creating demand for money. No taxes, no economy.
If not for taxation, who will pay for the police that keep you safe, the education programs that likely educated you (assuming you had some publicly funded education) and most of your customers, employees, and business partners? Public health that prevents epidemics? The list goes on forever.
Maybe everyone should have those opportunities. Maybe that’s the future. Maybe it’s the bright side of the consolidation of wealth that’s only accelerating.
For details checkout geo-libertarianism. But in short the argument is that the common resources, “land”, should be allocated according to the preferences of the commons (see John Locke), not the individual. In practice have land owners pay the would be non-owners it’s full market value for the privilege of being called the owner (see Rawls, Justice as Fairness for this step). Call it a land value tax (see Henry George) or call it land rent. However, since it’s a payment to the commons, not the state, the only thing to do is to divide it fairly as a public dividend.
End result: a fair and proper UBI.