My paper has been rejected recently but its content could be seen in the Research Square website. Why has this happened, and why did it also get a DOI link?
I asked and they answered:
Thank you for your message. Your work has been posted as a preprint on Research Square through the optional In Review preprint service offered by SpringerNature during journal submission.
A preprint posted on the Research Square Platform is issued an official DOI and becomes a part of the citable scholarly literature. DOIs are intended to be permanent records and cannot be fully removed. Additionally, GoogleScholar, ResearchGate, EuropePMC and Crossref automatically index preprints, creating a permanent digital presence. In Review preprints remain posted regardless of the status at the journal.
However, please note that the DOI also ensures that your work is properly linked to you, which helps avoid another individual claiming credit for your work. Finally, preprints are widely embraced by most major publishers, so a preprint is unlikely to negatively affect your publication chances.
Please let me know if you have any further questions or concerns.
So can I publish this work in another journal? Since it is not published? I don't understand why they have done that.