This completely ignores the part where one does literature search, NCBI, check if it's open access and ONLY THEN, resorts to sci-hub. There's a myriad of opportunities to verify the paper has been retracted. It's a non issue.
Unfortunately, it appears that once Sci-Hub has a copy of a paper, it doesn't necessarily have the ability to ensure it's kept up to date. Based on a scan of its content done by researchers from India, about 85 percent of the invalid papers they checked had no indication that the paper had been retracted.
I think most people would use the publisher's website first and then resort to scihub, because scihub requires a doi or publisher's link to get the paper.
I don't think this causes much concern, even if so, I believe a good amount of blame should still fall on the publishers and academic systems that encourages gatekeeping knowledge. Especially when these knowledges are generated by public money, then the public should rightfully have access to them.
I wonder how hard would it be to build a extension for a browser that checks the doi of the paper youre looking at on scihub against the live version, to see if there's a retraction/update to the paper, and list the date of the changes. I assume that information wouldn't be behind a paywall.
The reason for it being via an extension is to reduce load on sci hub, and for the lookup requests to be decentralised and live for the relevant paper
Are there any public examples of that? The retraction process is so unbelievably convoluted and slow that I am surprised to hear it is used for censorship.
The vast majority of papers that make serious errors and draw the wrong conclusions are never retracted. The sort of people needing to be told to check whether a paper was retracted before citing it are not likely to produce much that's of value even if they do so.