Can't afford a car or taxi/Lyft/whatever? You're going to lose hours every single day trying to get around. Hard to work two jobs to make a decent income when you can't get to either one expediently.
Don't have a job? Good luck getting to interviews on time. Good luck when they ask whether you have reliable transportation. And heaven forbid you have a felony on your record. And whatever you do, don't twist your ankle walking to the grocery store, because miss too much time from work and you're fired.
Oh, you do have a car? Good luck paying for decent tires, or gas, or the tow bill when it inevitably breaks down, or to replace the glass when someone breaks into it, or the insurance, or...
Money begets money. Poverty begets poverty.