UBI without a minimum wage promote workplaces that don't respect worker's labour, and socializes while privatizing profits. It would basically be the issue Germany had with social support before minimum wage was introduced. We need both UBI and a minimum wage.
The whole premise of the argument is that the workers in question are getting paid shit wages, so they're barely getting more than basic survival anyway. So I ask again, why would people put up with that when they could be using that time to look for a new job, learn new skills, become self-employed, etc.? How could giving workers the leverage to quit without the fear of becoming homeless possibly result in them having less leverage over employers than they do now?
what we need with ubi is a progressive tax structure that is across all forms of income equally. In the us the top rate is just above 6 figures and never goes higher and if its from investments it gets taxed in a different system designed for no taxes to be paid (same with corporate)