@khleedril What if there was a critical mathematical typo that was easily fixed by the authors and missed by the reviewers? I'm not talking about rewriting the paper, just saving some poor grad students in the future wasting an hour, a day, a month on bashing their head against an easily missed trivial mistake that otherwise changes the meaning? Most people will be accessing the arXiv version of this, is my guess, not the paywalled version. I declined for my library to pay Springer an APC for what is already free on the internet.