Purpose: Thousands of preprints related to Covid-19 have effused into the academic literature. Even though these are not peer-reviewed documents and have not been vetted by medical or other experts, several have been cited, while others have been widely promoted by the media. While many preprints eventually find their way into the published literature, usually through integrated publishing streams, there is a small body of preprints that have been opaquely withdrawn/retracted, without suitable reasons, leaving only a vestigial or skeletal record online. Others have, quite literally, vanished. This paper aims to examine some of those cases. Design/methodology/approach: For peer-reviewed literature, a retracted academic paper is usually water-marked with “RETRACTED” across each page of the document, as recommended by ethical bodies such as the Committee on Publication Ethics, which represents thousands of journals and publishers. Curiously, even though pro-preprint groups claim that preprints are an integral part of the publication process and a scholarly instrument, there are no strict, detailed or established ethical guidelines for preprints on most preprint servers. This paper identifies select withdrawn/retracted preprints and emphasizes that the opaque removal of preprints from the scholarly record may constitute unscholarly, possibly even predatory or unethical, behavior. Findings: Strict ethical guidelines are urgently needed for preprints, and preprint authors, in the case of misconduct, should face the same procedure and consequences as standard peer-reviewed academic literature. Originality/value: Journals and publishers that have silently retracted or withdrawn preprints should reinstate them, as for regular retracted literature, except for highly exceptional cases.
