In Alabama you cannot qualify for medicaid unless you are a "needy child, parent, caregiver, pregnant woman, or elderly/disabled resident". Meaning you can't qualify just for being low income.

While Amazon does provide decent health insurance, most lower income jobs do not.

I make good money, and have good health insurance and it would still cost me over $1k to go to the hospital. Imagine doing that with no health insurance while making $10/hr.

EDIT: You updated your comment so I'll add on. Sure, Amazon provides health insurance, but a lot of businesses don't. In 2020, ~31 million Americans didn't have insurance. Even if you have health insurance, premiums and deductibles can be astronomical.