I'm not assuming everyone with that salary qualifies. I think we just have different definitions of "sizable." I think given these numbers it's highly likely to be sizable percentage of salaries, essentially, that we're subsidizing for Amazon because of their refusal to pay living wages. What's sizable? 5%? 10%? 30%? Hard to say, and I don't exactly expect Amazon to come forward with these numbers.

Edit: Here's an article claiming it's more than 10% in Ohio that are on SNAP: https://www.bizjournals.com/seattle/news/2018/01/08/amazon-e...