Yes, a screenshot can be made of the creators who share their content on OnlyFans, this cannot be prevented.
Of course you are not allowed to sell photos and videos from another creator on your profile without permission from another creator because of course copyright rights are involved.
It is of course the case when people start sharing this on the internet or social media, the creators can sue those for plagiarism and point them to the copyright rights, one of the creators who suffered from this was Fabiola Volkers, but this content was quickly removed by the customer service
So when it is shared on social media or on the internet, the person who does this can be prosecuted. if this does happen, it is best to send an mail to contact service of the site for the best solution, because they can always retrieve who paid for it and which photo it was.
These rules are generally known to everyone, it is therefore recommended to state this by means of a text in the bio of your profile, this can easily be done in the following way, see an example here:
ALL content published on the platform is exclusive copyrighted material belonging to: name of creator.
Subscribers may not distribute or publish any content from my profile, violation of this will result in legal action.