As a third world country citizen I say that an SBI promotes equality and fairness, nothing more than that.
Pros:
Fairness and equality in a basic income.
Cons:
Products and services will need to adapt to that basic income, however some people will use their basic income to generate more income, while others consume their basic income for their dreams or desires. This eventually makes us go back to actuality, where people with more money earn more, and people with less earn the same, but product prices keeps going up.
Conclusion... It solves nothing, unless the only income source of the world is the basic income and it's fixed... and in that case, a whole lot of other issues will happen.