If we find that non-trivial numbers of parents blow all their UBI on XYZ, are we really going to let their kids starve? Or will we see that programs like SNAP need to remain in existence?
If the SSA and IRS don't have to do so much enforcement work for entitlements, that's a bunch of people there who can be laid off to save taxpayer money.
Eliminating the asset test (the area where undoubtedly some government employees work full-time) would actually increase the program cost. Most of the savings are actually derived from juggling the numbers behind "the cost of a nutritious diet".
I am personally not opposed to going full-throttle on something like SNAP - just send a free card to anyone with a SSN who requests one (I am sure agricultural and retail lobby would concur), but I think the potential savings are overblown - Medicare, SS and SNAP are generally tightly administered.