Assuming the unlikely scenario that no new revenue was collected, printing $x to give to every U.S. citizen would not cause every U.S. citizen to also lose x real dollars to inflation. The average citizen still ends up ahead.
Stable, positive, and modest inflation is actually a good thing! It's a major feature of being able to control the money supply: it is instrumental in preventing deflationary spirals, it circumvents the sticky wage problem, and it transfers wealth from debt owners to debtors.
This is not to say I am a big proponent of UBI before other better-tested solutions for the more pressing problems people face, but what you are suggesting is not, by and large, what is happening.
Stable, positive, and modest inflation is actually a good thing! It's a major feature of being able to control the money supply: it is instrumental in preventing deflationary spirals, it circumvents the sticky wage problem, and it transfers wealth from debt owners to debtors.
This is not to say I am a big proponent of UBI before other better-tested solutions for the more pressing problems people face, but what you are suggesting is not, by and large, what is happening.