Do you have any data on what they end up doing? I'm curious because I haven't met anyone unsuccessful who admitted to working in the adult industry when they were younger. I don't think a woman who is attractive enough to make 10k a month is going to end up struggling to pay rent when they're 30.
And this is becoming more and more severe because the competition is becoming exponentially fierce thanks to online porn websites.
But you seem to be asking whether attractive females can do well in their life, and yeah of course attractive females do have competitive advantage in life, but that has nothing to do porn. That's reality.
Also, your video being out there online forever means even if you try to start a new life it will be increasingly difficult to do so.
That's a huge price to pay IMO. Most people never experience this type of situation in their lives so don't understand how much sacrifice this is, but it is.
Most adult industry workers burn out quickly and move on to other things. But if your cousin manages to stay in the industry for even 10 years and still keep making more money that way (or if she uses the money she made through onlyfans and moves on to make more money through other means), then she probably deserves it since it's not easy to pull off.
Assuming you make money with your brain, you probably have decades ahead of you. Plus, you can expand your horizon (for making money) in various ways, while your cousin probably has only one way to make money which depends heavily on looks, which is a depreciating asset.