First let me say that I am not trying to defend universal basic income schemes, I think they are not a great idea. With that out of the way, the point you are m

First let me say that I am not trying to defend universal basic income schemes, I think they are not a great idea. With that out of the way, the point you are mentioning is a fundamental problem of universal basic income schemes. You can not promise to provide goods and services for basic needs to everyone unconditionally unless you have some magic black box providing the required goods and services. You can try to tweak the incentive structure here and there to make it unlikely that you will end up in the worst case scenario but you can not really get rid of it. Unless you advance technology and automation to the point where you can provide for basic needs without any labor at all, a universal basic income scheme is a promise you can not keep unconditionally.