That's not an easy fix at all. One of the forms of fraud they're worried about is people who aren't actually living in Denmark claiming benefits - generally by

That's not an easy fix at all. One of the forms of fraud they're worried about is people who aren't actually living in Denmark claiming benefits - generally by actually living in another country with lower cost of living and income (and potentially claiming benefits or working there without having to report that income). Universal basic income makes that easier if anything. There's also the huge difficulty of how to fund it, especially if you can't guarantee that the recipients are actually paying taxes to your government on their wages...