In the UK, at least, the welfare system is already extremely controlling of people's lives. I don't see why a UBI scheme, by necessity, would regulate people's lives in this way. If applied universally with no caveats - literally a cash transfer to citizens - then the government loses this control.

There are plenty of horror stories from those trying to work within the current welfare regime in the UK and I can't see an a priori reason that this would be the same for a UBI scheme.