That's not how it goes. The "bonus check" as they call it is a demogrant, or "prebate" of taxes to be paid on necessities.
Each and every valid SS card holder may choose to receive it.
The prebate is not in any way tied to income level. It is tied only to the family size of the valid SS card holders. I can get the prebate, you can get it (if you have a valid SSN), and Bill Gates can choose to get it.
Look here for an explanation.
I get it, and understand how it operates: everyone receives it. I was focusing on its effect on the low-wealth group as effectively substituting for current low-bracket and EITC policies. The prebate makes the biggest difference for the smallest spenders, effectively making them tax free.