If your content was rejected with "Text / Graphic Placement - Content contains placeholder text or graphics that would be difficult for a customer to edit or delete," it is probably because:
Placeholder text/graphics were placed on a non-solid color such as a gradient, texture, or pattern.
If including placeholder text/graphics in JPEG images or videos, you must place them over a solid color so they can be easily edited out.
For example, it would be difficult for a customer to remove the placeholder text in the image below because it is placed in the sky, which has a subtle color gradient.
However, the placeholder text in this example would be easy to remove using photo editing software because it is placed over a solid black background.
Photo by Alex Cherepanov
If you don’t understand the reason for the rejection of your images or if you need additional clarification, you can always contact contributor support.