I certainly don’t know this employment demographic but I would think this might just encourage people to quit without notice mid-week, especially if the job market is reasonably tight and they can get other fast food jobs easily when desired. Put some quick cash in their hands and temptation may overwhelm work ethic more and more often.
If there are plenty of such jobs available and that temps workers to move from job to job, then the employer can take measures to encourage their employees to stay under their employment.