I agree with the possible liability aspect but if they are doing it already, i.e. taking notes or rubric scoring, then it's just a matter of sending a summarized version of that and hopefully it's feedback from multiple people and not just one person's opinion.

The negativity may likely exist from no response/lack of feedback -- which can be frustrating for ppl that spent time/effort), but at least as the previous poster mentioned some people do appreciate feedback.

Also, recently noticed that companies have automated questionnaires asking how the recruiting process was or can be improved -- wondering if there's any improvements based on feedback.

As a side, it's been kinda interesting to read glassdoor responses for how people were treated/felt during the whole process (timing, professionalism etc...)