I doubt they'll be able to get away with the terms as is, but it wouldn't surprise me if they manage to successfully charge significantly more than Patreon and still get a lot of customers.
I remember their promo videos promising access to "millions of people" and "your imagination is the limit". Turns out it isn't feasible to spam all the people in your friends list with all your updates, so Facebook decides who sees which. Want more people to see your posts? Your wallet is the limit.
I'm not seeing anything inconsistent in that position. They didn't promise free access to their audience. The imagination of how much you can spend is indeed the limit.
It was literally the default setting until they started making people and orgs pay to reach all _of their own, organically grown_ audience.
People were advertising their FB pages in advertising, on billboards and signage all over the country for a couple of years. I'm talking like Realtors and run-of-the-mill small businesses, etc. It all just turned out to be free advertising for Facebook because they changed their mind after reaching scale and needed to turn on some more profit.
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.