I seriously do not get the appeal of an agency-run only-fans ... I mean, the appeal behind onlyfans is the "direct" connection and channel to communicate with the person behind the account, right? As soon as you are positive that there's an agency as a middleman, it basically becomes yet another porn site with extra steps and all in all for more money (assuming you'd sub to multiple of the performers from a particular porn site...)
I know for a fact, that there are industry performers (i.e. still actively shooting "main stream" porn for studios), who run their onlyfans on their own, and any DM answer they send comes from them personally. Sure, that means you can't chat with them round the clock, and answers for europeans come in the evenings, when it's morning on the west coast, but they manage to do that, without hiring it out to companies, so it IS possible to do. (in multiple cases, verfied it via cam sessions close to the OF chats, and the performers knew what we had chatted about...)
On the flip side, I know that there's agencies, who have literally chatted with members/fans while the performer was in some way incapacitated or on a live stream, and that basically killed the OF/subscriber numbers...