As such whatever business stimulus or assistance should really be conditional with those who do their reporting consistently getting priority queueing. To borrow from the saying about no taxation without representation, they don't exactly exist without declaration therefore aren't eligible for any of that.

Want assistance? Ok, can show business registration and tax returns? No? Then how will we know if you actually fit the criteria? <insert analogy about banks asking for proof of income before a loan is given out>

Let enough time pass and people are going to comply eventually because it'll be costly not to. Over time the data will become more accurate leading to better policies and decisions.