And providing feedback is very likely to hurt your reputation. One major company did give me feedback, and I've made fun of them endlessly for it - they explained that the manager loved me, I did great on systems design and architecture, but I couldn't pass the hiring committee because I didn't do well enough on tree traversal tricks.
Even that in a way is useful to them. If they are constantly getting confused, bemused, or angry responses to what they think is honest feedback, it is a red flag about their hiring process.
Every hiring process under the sun has a large, vocal group of people who think it's shit-tier. (Some people like me are equal opportunity haters - I've never seen a process that didn't have stupid flaws.) If you give feedback, eventually the group for your hiring process is going to find you.
