Pixelating and blurring images has long been known to be insufficient in completely obscuring information [1]. In fact, in a lot of computer vision work, the image resolution is reduced to ignore noise and facilitate the workload for algorithms anyway. Completely destroying information through blacking out is preferable.<p>[1] <a href="https://dheera.net/projects/blur" rel="nofollow">https://dheera.net/projects/blur</a>