Because those jobs don't pay enough for the people to afford housing and all the other necessities. And if the ONLY thing it affords you is housing, then you just sleep, wakeup, work, eat plain rice, sleep, repeat, without progressing anywhere. Whoops got sick for 3 days with some terrible shit, fired, lost apartment, car repoed, back to being homeless. Why spend the effort in moving nowhere?
And the hiring processes themselves are usually absolute shit. "Give us your resume, then type your entire resume into these boxes, then randomly 6 months later after you have done that to 100 different places you get a call to interview the next day on short notice, come in with a paper copy and looking clean and fresh, pass a drug test since you certainly wouldn't have dared smoke some weed while being poor or homeless, "Okay thanks we might call you but probably not because we are interviewing 60 people for this position", ect.
And the hiring processes themselves are usually absolute shit. "Give us your resume, then type your entire resume into these boxes, then randomly 6 months later after you have done that to 100 different places you get a call to interview the next day on short notice, come in with a paper copy and looking clean and fresh, pass a drug test since you certainly wouldn't have dared smoke some weed while being poor or homeless, "Okay thanks we might call you but probably not because we are interviewing 60 people for this position", ect.