People who can't manage their own finances also tend to do badly at acquiring program support when aid comes in other forms too. However, it might be an improvement in overall effectiveness for charities to operate in models which charge part of the money from a basic income stream to administer aid (it greatly simplifies effort for charities which would normally have to devote a lot of attention to just getting together funding).

On the other hand, being able to 'sign over' a portion of one's basic income might open up all sorts of other abuses. (e.g. some sort of payday loan company that says, sign over your Basic Income for a year and I'll give you a lump sum right now...)