it is naked chicks online, but they engage with their followers daily/nightly. So you see a pic gif video of a hot OF thot on twitter/twitch/insta/tiktok, you go to her page subscribe for whatever shes charging. They post free pics and vids but the dirty stuff most want to see are pay per view, they send a msg to your inbox with something like "hey babe want to see me fuck my ass with a sharpie? buy this video" some buy the video some don't. They also do sexting and charge crazy prices for it.
So wtf do guy pay for this when there is free porn, its a connection, you are talking to the model (sometimes) some like to chat and they will have several conversation going on at once, the more you tip the more engaged or more attention the guy gets. They also sale custom videos, from sharpie in the ass girl to hey I want you to get fucked by 5 guys and cum all over your face, how much? So now you have your very own video of some OF whore you've been lusting over getting fucked by 5 guys and screaming your name or whatever. The dirty secrete OF doesn't like getting in the news, many of these girls will do meet ups aka escort.