No. It's annoying because the students can't make money, but there's nothing immoral about it (unless your religious beliefs are set up in a way that not having a job means you're sinning).
No
no
no
No
No, it's not really needed for university students to do so
No, it's not mandatory for university students to have a summer job.
Not wrong, but most University students need to earn money over the summer.
Yes
No
no
No
No not really