Earlier quoted context omitted.
There is absolutely no way you could get rid of all of the other programs. If someone is irresponsible with their money (and there will be at least some), I doubt anyone wants families starving in the streets, which is kind of the way a bunch of the current programs are set up (at least in the US).
Pay it weekly.
Don't pretend you can legislate around that problem-- if payday loans against UBI were illegal, the black market (loan sharks) would fill in the gap.