I hear all the time that people have applied for 'hundreds' of jobs and not even had an interview. I hear this from graduates as well as more mature candidates.
I've been recruiting to my team over the last year and advertised about 7 or 8 roles. They BFF e been fairly popular and I have sifted around 120 cvs per role in the first two weeks.
My point is that only about 10% of applicants ensure their cv is tailored to the role.
I spend about 3 minutes looking at each applicant so need to be impressed quickly.
Most CVs start with a statement looking for a career in science' when the role is complaints manager for example.
By making a few changes to a CV so it highlights the skills for the role you want would be easy to do but very few even try.
So I'm not surprised people have no luck in their job search when they can't be bothered with the application.
AIBU to think this is the reason they are rejected?