Creator Plan prohibits the use of any Actors that are not owned by the developer.
But this restriction seems a bit strange for Actors whose source code is open source, since I can simply copy the source code and create a duplicate Actor as my own. In the end it doesn't restrict usage in any way, it just adds to the inconvenience.
A simple example is
https://apify.com/lukaskrivka/csv-file-to-dataset