A paper with an identical title was later published in the journal mentioned in the offer. The fact that the publication date comes after the date of the offer supports the plausibility of a link between the offer and the paper.
What should you do if you spot misconduct in a paper?First, you can comment on PubPeer.com, a website for post-publication peer review, and provide the relevant evidence. Here are some best practices for commenting on PubPeer:
https://osf.io/2kdez/files/sghaqSecond, you can report the issue with a publisher. See guides and contact details here:
https://osf.io/2kdez/files/4edk2