You ignore human nature. I used to say "the brain is a transformer", not in the sense of how the current batch of AI transformers work, but in the sense of an mathematical transormation. The input gets transformed into human behavior. Human behavior is not something that exists independently of our environment and stimuli. And specifically: if nothing comes in, nothing comes back out (if you actually take away inputs, right up to the point that the brain stops controlling the body and you die, but you don't have to drive it nearly that far to just make sure nothing happens anymore).

Perhaps surprisingly, humans don't object to that. Our human intelligence works by subtracting what we can predict from the inputs and then focusing on the portion that remains.

So if AI either prevents interactions with humans or makes them more predictable, then human minds just ... stop. Literally. Humans won't do anything anymore.

UBI will either fail, or it will succeed and humans will just stop.