How is it possible to buy and publish a Q1 paper? A few days ago I saw an advertisement that claimed that they could write and publish Q1-Q4 (Q: Quartile) Research paper (with various prices e.g. 200$-500$) in less than 6 months and sell it to anyone (as the author of that paper) who wants a Research paper like last year PhD students, academic peoples, M.Sc. students, etc.
Q1: I wonder how it is possible that they are so confident that their paper will be published in less than 3-6 months?
Q2: How it is possible to buy and publish a Q1 Research paper?
Q3: Does this count as plagiarism?
This sounds like a scam, so I doubt you'll get whatever they promise
It's possible (though unlikely and unethical) for anyone capable of producing the research to exchange money for an edited author list, but the problem of finding a buyer in the same area of your expertise is not trivial and probably doesn't make for a profitable strategy unless... See above
Absolutely yes. It's plagiarism to claim someone else's work as your own, even if you pay them for it.