Universal Basic Income has never been tried, because all the trials lack "Universal" component to it, they are limited in scale.
Once you start giving out free money to millions of people the only result is inflation, and people receiving UBI would not be better off at all.
In fact, the closest thing I can think of that would be similar to introducing UBI was "500+" program in Poland, which, as the name implies, was about giving families 500 PLN monthly per each child that they have. As you might have guessed, inflation in Poland has been brutal since then.
Once you start giving out free money to millions of people the only result is inflation, and people receiving UBI would not be better off at all.
In fact, the closest thing I can think of that would be similar to introducing UBI was "500+" program in Poland, which, as the name implies, was about giving families 500 PLN monthly per each child that they have. As you might have guessed, inflation in Poland has been brutal since then.