Dude, you are not right. These are watermarks just like you said: "you put on the foreground and partially hides the content". These are hides the content, makes it less visible.
Edit: I added images to make myself clear: (Note: with right click and "Open image in new tab" you can see it in full size and check the details.)
Can you see now what am I talking about, dude?
If not, please check again the pictures I provided to you. Pay attention to the small details, eg:
- you can see the Kards logo
- through the diamond
- over the monster's body and weapons
- and you can see the stripes too in the body as well
So, what do you call this if it's not watermark? :D
My problem is: this is the paid version of PNP files and it seems to me the author does not trust other people or you can call it "design decision".
At least it could be useful to know this before buying.