It doesn't necessary apply to this specific posting. But in general, as with many open source projects out there, the point is in increasing author's visibility

It doesn't necessary apply to this specific posting. But in general, as with many open source projects out there, the point is in increasing author's visibility on the net and assisting author's CV in finding a job. And there is nothing bad with this. It is just that many authors don't want to articulate on this and are trying to come up with some artificial rationales.