Absolutely correct and the best comment here imo. It’s very different to provide an audience vs. providing a service.
So logically creators should only use FB for access to new audience, build a relationship with the newly acquired audience, and pivot to direct billing or Patreon for recurrent collection.
Sending an API request, to the credit card company, to bill the monthly payment, does not cost a lot of money.
Getting your audience to switch platforms for the monthly payments is a compartively easy thing to do, compared to setting up your own video hosting site.