I have noticed that many accounts on shutterstock with stolen content from apps like Kinemaster....
And based on the portfolio names and account creation date, and same content in all account...Most of these accounts created by one person/same family members...
The worst part is that Shutterstock promoting these portfolios by keeping their content in first pages when you search "Green Screen".
Here is the list of portfolios...
https://www.shutterstock.com/g/Laju+King/video
https://www.shutterstock.com/g/Muhammad-Yousaf/video
...
It's also possible that it actually is 'different' guys - because sometimes one guy will brag about how much $$$ he is getting, and then 'share' a complete set of links and others do the same. (Sometimes on youtube, sometimes on facebook, sometimes other areas).
You could be right that it is just one guy - but it could also possibly be multiple individuals spamming stolen accounts.
And for cobalt/F8/zeljok that like to get morally outraged - look @ the names of the accounts. What nationality does it look like? Hmm. Thinking cap time.
As for WHY shutterstock doesn't do anything... My guess is because they don't care - and they get more $$$.
They only care if it affects their $$$.