> A mega journal (also mega-journal and megajournal) is a peer-reviewed academic open access journal designed to be much larger than a traditional journal by exercising low selectivity among accepted articles. It was pioneered by PLOS ONE. This "very lucrative publishing model" was soon emulated by other publishers.
https://en.wikipedia.org/wiki/Scientific_Reports
> Scientific Reports is an online peer-reviewed open access scientific mega journal published by Nature Portfolio
https://en.wikipedia.org/wiki/Mega_journal
> A mega journal (also mega-journal and megajournal) is a peer-reviewed academic open access journal designed to be much larger than a traditional journal by exercising low selectivity among accepted articles. It was pioneered by PLOS ONE. This "very lucrative publishing model" was soon emulated by other publishers.
Basically it's bunk-for-hire.