Today I found the website http://shutterdowner.com/

It allows you to get 1000px wide non-watermarked image from any shutterstock item.

Here's simple example:
http://api-download.shutterstock.com/gatekeeper/W3siZSI6MTUwMjgyMjI4NCwiZCI6InNodXR0ZXJzdG9jay1tZWRpYSIsImsiOiJwaG90b1wvNjk2Mzc1OTEwXC9tZWRpdW0uanBnIiwibSI6MH0sIkE4aWdOV0h3WW1hbExLV0JEVEhUWWMxcHRBRSJd/shutterstock_696375910.jpg?token=exp=1502822284~acl=/gatekeeper/W3siZSI6MTUwMjgyMjI4NCwiZCI6InNodXR0ZXJzdG9jay1tZWRpYSIsImsiOiJwaG90b1wvNjk2Mzc1OTEwXC9tZWRpdW0uanBnIiwibSI6MH0sIkE4aWdOV0h3WW1hbExLV0JEVEhUWWMxcHRBRSJd/shutterstock_696375910.jpg*~hmac=453f923d0e62f863ab45db0d6e66338589c32e55

As I can see from the link it leverages Shutterstock's API service. Simple googling showed me being right:
https://www.earngurus.com/download-shutterstock-images/

As far as I can understand any of Shutterstock's API deals (like deal with FB or Google) creates an exploit to download our images for free, with no compensation. Ever. what???