OF is porn with a fresh coat of paint.
Sure, it is advertised as something one does as "a lifestyle", but when the model works for a professional studio with metrics to reach and gig workers chatting with customers while pretending to be her [1], how is that not a job? And more important, how do you know that the model on screen is doing what (s)he's doing because of their "lifestyle" and not because they are behind on their weekly numbers and may otherwise lose their spot in the agency's rotation?
[1] https://news.ycombinator.com/item?id=40391797