I start with two that I found and reported that many of my videos have been copied. I highly believe I am not the only one they stole from. Here is the first one who had more than 3500 videos (stolen) on depositphotos and I got reported and removed. (https://depositphotos.com/portfolio-42391792.html?content=photo [nofollow]) On shutterstock he has "very similar" footages with somebody else. Here is his portfolio on shutterstock:
https://www.shutterstock.com/da/g/viodumivioche/video?sort=newest [nofollow]

stolen:https://www.shutterstock.com/da/video/clip-1061956324-ecology-symbol-on-plate-green-sauce

original: https://www.shutterstock.com/da/video/clip-1059364913-ecology-symbol-on-plate-green-sauce-vegetarian [nofollow]

...............

Second thief that recently got reported too.

https://www.shutterstock.com/ru/g/teoharipetrescu2/video [nofollow]

And lets keep a list of thieves (for videos) to check regularly.