For example janitorial workers. At an old workplace of mine there were three shifts of at least two workers three during the day. Then they were cut to just one worker per day and evening no nights. One person frantically running from bathroom to bathroom not even getting to the other tasks that had to do like vacuuming.
Then they cut their hours to part-time for all but two workers. At minimum wage it was barely livable on 40 hours per week.
They also ask the night worker to come in the next day with less than a seven hour gap from the previous shift.
Even at the punch clock they were scolded for punching in or out a mere 1 minute off from the time to work or end.
I could tell when talking to the staff many of them felt defeated and this was the only job they could do. They just had to sit there and take it.
Guaranteed income (GI) would at least buffer some of the anxiety. I could also see businesses knowing it existed would cut worker hours to part-time. But if part-time plus GI was enough then the worker has the power.