The biggest and most measurable benefit is that it keeps you writing. You can often spark creativity by simply being creative, that is, you write five or seven days per week, and you can fill up that writing time fairly readily. But if you only write three times per month, you may find you have writers' block when you make the infrequent attempt. There is something about the pressure of deadlines or at least the pressure of your own internal expectations. It helps to not have a blank page to stare at all the time.
Just because you can right-click an image or take a screenshot does not mean you have the right to just take it. And do not get me started on wiping off someone else's photographic watermark. Just don't do it. Don't be a jerk.