I think a bunch of people around here used it for tutoring and yoga classes and such. It was meant to be a Patreon. But after a while, they stopped because everyone assumed it was "tutoring" and "yoga classes".
Perhaps this is why every platform ends up banning or pushing all the XXX to a red light district.
It was started by the founder of clips4sale and intended primarily for the findom kink. They really pushed the SFW angle early on as a way of hanging on to Stripe's low processing rates.
There are still people on there who make $$$ by pretty much just publishing Instagram-level stuff, but in bigger sets + videos. Most actual cosplayers moved off OF eventually and either sell directly or via Patreon now.
It doesn't always have to be hardcore, but the implication of having an OF is "porn star".
Perhaps this is why every platform ends up banning or pushing all the XXX to a red light district.