My take is OF was a way sex workers (from porn stars/internet models) to SPs could profit off of their looks/talents in a fairly safe an anonymous way. I've never subscribed, but I have seen many sites that have leaked videos and images from OF, so there are obvious holes in the security. Then there is the whole thing about how much someone makes on it. From what I can tell, if you're in the top 1%, you probably make a LOT of cash every month. I don't know what percentage OF takes from the subscriptions, though I imagine it is probably 30% (which is what Apple apparently collects from all sales in the App store), but who knows. So, considering the million OF accounts, there are a huge number that make next to nothing....In many ways, it's a pipe dream for most performers to make a serious living doing it. It's like becoming a YouTube Influencer. Sure, there are people who are able to break out and parlay that into big money doing sponsored shit and getting millions of views. But there are a huge number of channels that have a handful of subscribers and maybe a hundred views.
Bottomline, if you're interested in that type of content, you can probably find it online fairly easily (though I hear many of the models can be very proactive with copyright takedown notices). But, considering there is so much free content where ever you look, why bother? Unless you had a very specific fetish, or just couldn't live without seeing a specific model, it really doesn't make a lot of sense to me.