This is definitely fraud. No one can legitimately publish a paper every 5 days. But on the bright side, it's mainly fraud against the university administrators

This is definitely fraud. No one can legitimately publish a paper every 5 days. But on the bright side, it's mainly fraud against the university administrators who are too lazy to develop better metrics than "number of papers published" to evaluate the faculty. These fake papers appear in journals no one pays attention to, and are only ever cited by the fraudsters and their conspirators. The few exceptions are American or European authors who manage to cheat their way into prestigious institutions. Those frauds can go on for quite some time and create their own little sub-fields.