[omaranto]

This sounds to me like asking "Why would a scammer do something that makes the scam more plausible?". The answer is, of course, to make more people fall for it. Their target is tiny (people that want to write math papers!), so they need to give at least the appearance of being legit.

[curiousdannii]

It depends if the authors are in on the scam or not -- is it scamming authors of their money, or scamming universities who are checking CVs?