One point is that basic income would mean an increase in new businesses forming. The problem is that while yes, more people will have the ability to start a business. The increase burdon of taxes and most likely, regulations that go along with it, will make it difficult to move from the startup phase to actually running a profitable company.

Countries like denmark and sweden are great examples of this in action: small companies are scarce,the majority of investors avoid them, and most people either work for the government or a large company.