If there was only one pipe or doesn’t really matter if there is a screen or not. If the pipe had a cover she would have still been stuck on the bottom and no one likely would have been able to get her out of the water. If a second pipe had been there the pressure wouldn’t have built up enough to suck her in.
I think it is to avoid image searches from easily finding the original image. You’ll also find pictures flipped, tilted slightly, or have their colors changed just a little bit.