Was looking at the keyword suggestions earlier and got sidetracked when i noticed this.
Many of the top hits for certain phrases contain keywords that are duplicated multiple times in a single keyword.

Things like "waterfalls waterfalls waterfalls waterfalls water" and so on.

Attached image is just from "waterfalls" search showing the most common keywords from the 50 images it displayed.

So is this actually effective algorithm gaming given how many times it seems to appear or just some random artefact?  I guess it definitely proves theres no human checking keywords for accurate or content on upload...