It's not about handing over copyright but it's generally agreed that publishing multiple copies of the same work is a bad thing. This is typically done by resea

It's not about handing over copyright but it's generally agreed that publishing multiple copies of the same work is a bad thing. This is typically done by researchers to boost their paper count (+ a bit of self-citation), and can make a hypothesis seem better supported than it is. So only dodgy journals will re-publish work that has been published elsewhere.