It's not just "taking a foot pic", there's so much work that goes into successful sex work. Creating content people want to see is a job, it takes skill and effort and time. It takes knowing your audience and catering to them, it often includes a great degree of acting and social skills, and building a persona. The camera work, lighting, and filming takes skill as well.

You might not see the value in it, but it's not because there isn't any- the music industry is in shambles for reasons unrelated to sex work.