The big risk of UBI is that it can lead to a rise in populism. This is very obvious in the former communist countries of Eastern Europe. A large part of the population is fully dependent on the state for pensions or some sort of basic income and lots are even working as civil servants. This sizeable section of the population is very susceptible to populist promises or scares. “If X wins, they will cut your pension” type of rhetoric. This has very perverse and non-intuitive consequences. People vote for obviously corrupt leaders in the hope that they would share the spoils with them, and to some extent they do. If a western country adopts UBI, I can easily see a similar path. Maybe not immediately but over 20-30 years as more and more people become dependent and know nothing else. This is a very slippery slope.