If you have been a victim of theft by a content farm you have these options
File a copyright removal request
https://support.google.com/youtube/answer/2807622?hl=en
Send a Cease and Desist Letter (not to be confused with an Order)
https://www.dbllawyers.com/what-are-the-grounds-for-a-cease-and-desist-letter/
https://www.lawdepot.com/contracts/cease-and-desist-letter/?loc=US
File a copyright removal request
https://support.google.com/youtube/answer/2807622?hl=en
Send a Cease and Desist Letter (not to be confused with an Order)
https://www.dbllawyers.com/what-are-the-grounds-for-a-cease-and-desist-letter/
https://www.lawdepot.com/contracts/cease-and-desist-letter/?loc=US
Comments
An actual ORDER is a legal document inciting action is inevitable if not removed.
GameToons and Hornstomp's business emails are paywalled by data collection sites.
More helpful information on cease and desist letters
I got my own art removed by a small content farm by aggressively persisting i wanted my content removed via email despite them trying to barter for just crediting me.
Be firm and steadfast.
That cannot be 100% prevented outside of never showing them but these are some precautions based on my on experience and what i've seen from the content farms.
Never share transparent images of your OCs publically, always put a background on it even a white background will work.