Feedback on a rejected resume does not give you money or a job, but it can help you indirectly by making it easier to find other jobs.
Keeping your resume on file for future opportunities is exactly the same. It doesn’t give them money or a candidate but it makes it easier to source candidates later by giving them a pool to start with. If they won’t give you a small freebie to help you, don’t give them a small freebie to help them.