It's the celebrity appeal, the amount of people that yearn to see their celebrity crushes naked even when there are more attractive women out there who do post naked stuff. But they want what they can't have. In Sophie's case though she's not even that famous and she HAS posted nude stuff, very tame nude stuff but still nude stuff, so people have seen her naked. I guess she is famous enough though that more people know about her than other OF girls.
I get that maybe some people still want to actually see her actually doing something besides strip teases and posing, real action like at least some spreading or fingering or something but it doesn't seem like she will do any of that anytime soon, not like some of the other bophouse girls who have already done B/G, dildo and other spicy content but don't have as many followers.
Aishah Sofey has a lot of followers/subs too and yet she hasn't even done any nudity at all, no topless no spicy content or anything but people say sub to her OF. Both of them are hot, but there are plenty of other women who are just as hot or hotter and do a lot more hardcore stuff.