The no-strings-attached is never going to happen but is not a desirable condition either; the problem is that the strings attached are only one-way at the moment.
Back in simpler societies, when a generous father would patronise the expenditure of a child, the recklessness and other socially undesirable behaviours of said child would be personally incriminating to the father. Today's states have zero consequences for patronising and supporting bad behaviour.
If a judge keeps releasing a serial rapist from prison, the state feeding him in food stamps, stipends, soup kitchens and other ways, can I sue the judge or the state when the rapist rapes my daughter next?
UBI will try to come with strings attached that protect the bureaucracy's objectives - but the bureaucrats also have a way to wash their hands from the sins of their dependants this way.