As mentioned in the article, Nat Comm has been doing this for a few years now. I have found it immensely interesting and helpful for my own research to have access to the peer review files (usually in the Supplementary Information [1]). It is a great way to show younger students the process and formatting behind peer review and also have examples of what constitutes a positive review process. As an author, it does feel like a positive as well to have the peer review file out, so that readers who are interested can see how the work developed, and what points or weaknesses the reviewers focused on.

[1] randomly chosen from homepage - https://www.nature.com/articles/s41467-020-14530-7#Sec11