Why are university lecturers so strict?

Lecturer courses in universities are very strict, because nowadays, basically, you have to pass exams or interviews before you can enter.

Then the lecturer's class will definitely be more rigorous. After all, it is aimed at many students and other audiences. If you are here, you must do better.

Therefore, the future will only become more and more strict, because the content must be better and the content needs to be easy to understand.