Half of the students in my year have a job.
Most work in coffee shops, and a few give to school children.
The money matters, and it is not the only reason people work.
A job teaches things that no course covers: arriving on time, handling a , working with somebody you dislike.
The danger is the number of hours rather than the work itself.
Research in several countries finds that fall once a student works more than fifteen hours a week.
Below that line, students who work often do slightly better than those who do not.
The explanation offered is that a busy week is planned and an empty one is not.
My own rule is two a week and none during the examination month.
An who cannot accept that is not worth the job.