I bet its written into their contracts. Once they gain fame, they are not free until contract is finished. Which also brings up sports and music.
NFL, NBA… taylor swift bitching about rights to her music.
Epstein
Through his nephew Peter Soros
https://nymag.com/intelligencer/2019/07/jeffrey-epstein-high-society-contacts.html
https://www.pdsoros.org/fellowship/governance/peter-soros
https://www.pdsoros.org