Well, no. The prebate isn't welfare but a refund.
But with the present system there are many who rightly (or otherwise) report no tax obligation for a good amount of income that they buy things with and some have other sources of unreported income and even gifts and/or loans.
There are many sources one can obtain money from but probably the easiest wasy of all for many is just to lie to Uncle Sugar - or remain silent while playing a sort of Russian Roulette with the tax system.
Regardless of the amount of taxes actually paid or even if no taxes were paid at all. Marxism.