I've searched and downloaded from Shutterstock for over 10 years. Keyword spam is the number one issue with Shutterstock. I'd estimate at least 15% of results are keyword spam - after extensive filtering of search results. I've even added 6-10 "exclude" terms only to find images that contain nothing even remotely related to my search.
For instance, try this search that should result in at least a few images of several isolated vehicles viewed from overhead: isolated cars top view overhead
exclude: images with people
exclude terms: truck, motorcycle, side, shoe, commercial, bus, lorry